Landforms and Life – MCQs

MCQs on “Landforms and Life” (Theme A — India and the World), suitable for NCERT & CBSE Class 6 level.

1. Which of the following is a landform?
   A. Glacier
   B. Cloud
   C. Wind
   D. Rain
   Correct: A. Glacier
   Explanations:
   A: Correct — glaciers are large masses of ice that shape landforms through erosion and deposition.
   B: Incorrect — clouds are atmospheric, not land features.
   C: Incorrect — wind is an agent of change, not a landform itself.
   D: Incorrect — rain is weather, not a landform.

2. What is the primary process that creates mountains?
   A. Erosion by rivers
   B. Tectonic plate movement
   C. Wind deposition
   D. Coral growth
   Correct: B. Tectonic plate movement
   Explanations:
   A: Incorrect — rivers erode and can carve valleys, but don’t create major mountain ranges.
   B: Correct — collisions and uplift of tectonic plates form fold mountains.
   C: Incorrect — wind deposits sand (dunes) but not mountain ranges.
   D: Incorrect — coral growth builds reefs and atolls, not mountains.

3. Which landform is formed mainly by deposition of river-borne sediments at a river’s mouth?
   A. Canyon
   B. Delta
   C. Plateau
   D. Glacier
   Correct: B. Delta
   Explanations:
   A: Incorrect — canyons are formed by river erosion, not deposition.
   B: Correct — deltas form where rivers slow and deposit sediments at their mouths.
   C: Incorrect — plateaus are uplifted flat areas, not river deposits.
   D: Incorrect — glaciers are ice masses shaping land by erosion and deposition, but not river deltas.

4. Which of the following best describes a plateau?
   A. A low-lying wetland
   B. A steep, pointed peak
   C. An elevated flat area
   D. A narrow coastal inlet
   Correct: C. An elevated flat area
   Explanations:
   A: Incorrect — wetlands are low-lying, not elevated.
   B: Incorrect — pointed peaks are mountains, not plateaus.
   C: Correct — plateaus are high flat regions standing above surrounding land.
   D: Incorrect — a narrow coastal inlet describes a fjord or bay, not a plateau.

5. Which Indian mountain range is the highest and youngest?
   A. Aravalli
   B. Himalaya
   C. Western Ghats
   D. Vindhyas
   Correct: B. Himalaya
   Explanations:
   A: Incorrect — Aravalli is one of the oldest ranges and not very high.
   B: Correct — the Himalaya are the highest and geologically young fold mountains.
   C: Incorrect — Western Ghats are older and lower than the Himalaya.
   D: Incorrect — Vindhyas are lower and older than the Himalaya.

6. What is terracing used for?
   A. Creating deep sea ports
   B. Farming on slopes to prevent erosion
   C. Making sand dunes
   D. Building bridges over rivers
   Correct: B. Farming on slopes to prevent erosion
   Explanations:
   A: Incorrect — terracing is not related to sea port construction.
   B: Correct — terraces create flat plots on slopes for agriculture and reduce soil loss.
   C: Incorrect — sand dunes are formed by wind, not terracing.
   D: Incorrect — bridges are engineering structures, unrelated to terracing.

7. Which landform is characterized by very low rainfall and sparse vegetation?
   A. Delta
   B. Desert
   C. Plateau
   D. Fjord
   Correct: B. Desert
   Explanations:
   A: Incorrect — deltas are fertile and receive river deposition.
   B: Correct — deserts receive little rainfall and have sparse vegetation.
   C: Incorrect — plateaus vary in rainfall; many are not arid deserts.
   D: Incorrect — fjords are glacial inlets, not deserts.

8. What causes a rain-shadow area?
   A. Ocean currents cooling the land
   B. Mountains blocking moisture-bearing winds
   C. Volcanic eruptions blocking sunlight
   D. River flooding the plains
   Correct: B. Mountains blocking moisture-bearing winds
   Explanations:
   A: Incorrect — ocean currents influence climate but don’t create rain-shadows.
   B: Correct — the leeward side of mountains receives less rain, creating rain-shadows.
   C: Incorrect — volcanic ash can cool climate but doesn’t create a typical rain-shadow.
   D: Incorrect — river flooding does not produce rain-shadow effects.

9. Which soil type is commonly found on alluvial plains?
   A. Laterite
   B. Sandy desert soil
   C. Alluvial soil (silt)
   D. Glacial till
   Correct: C. Alluvial soil (silt)
   Explanations:
   A: Incorrect — laterite forms in high rainfall tropical areas, not alluvial plains.
   B: Incorrect — sandy desert soils are typical in deserts.
   C: Correct — rivers deposit silt and sand forming fertile alluvial soils on plains.
   D: Incorrect — glacial till is deposited by glaciers, not rivers.

10. Which feature is typical of a river’s upper course?
    A. Delta formation
    B. Meanders and oxbow lakes
    C. V-shaped valleys and rapids
    D. Wide floodplains
    Correct: C. V-shaped valleys and rapids
    Explanations:
    A: Incorrect — deltas form at the mouth, not the upper course.
    B: Incorrect — meanders and oxbow lakes occur in the middle to lower course.
    C: Correct — steep gradients in the upper course create V-shaped valleys and rapids.
    D: Incorrect — wide floodplains occur in the lower course where gradient is gentle.

11. What is a fjord?
    A. A desert oasis
    B. A wide coastal plain
    C. A narrow inlet with steep sides formed by glacial action
    D. A volcanic crater lake
    Correct: C. A narrow inlet with steep sides formed by glacial action
    Explanations:
    A: Incorrect — an oasis is a fertile spot in a desert.
    B: Incorrect — coastal plains are broad and flat, not narrow steep inlets.
    C: Correct — fjords are glacially carved valleys flooded by the sea.
    D: Incorrect — volcanic crater lakes form in calderas, not fjords.

12. Which of these is a human-made method to reduce soil erosion on slopes?
    A. Deforestation
    B. Terrace farming
    C. Overgrazing
    D. Draining wetlands
    Correct: B. Terrace farming
    Explanations:
    A: Incorrect — deforestation increases erosion, not reduce it.
    B: Correct — terracing reduces slope runoff and soil loss.
    C: Incorrect — overgrazing causes erosion.
    D: Incorrect — draining wetlands often increases erosion and reduces flood control.

13. Which of the following is NOT a type of coastal landform?
    A. Beach
    B. Dune
    C. Atoll
    D. Butte
    Correct: D. Butte
    Explanations:
    A: Incorrect — beaches are typical coastal landforms.
    B: Incorrect — dunes commonly form along coasts.
    C: Incorrect — atolls are coralline coastal/island features.
    D: Correct — buttes are isolated hills, typically inland, not coastal-specific.

14. What is the main cause of tides?
    A. Wind blowing over the sea
    B. Earth’s rotation alone
    C. Gravitational pull of the Moon and Sun
    D. Ocean currents
    Correct: C. Gravitational pull of the Moon and Sun
    Explanations:
    A: Incorrect — wind causes waves, not regular tides.
    B: Incorrect — Earth’s rotation contributes to tidal timing but gravity is primary cause.
    C: Correct — tidal bulges result mainly from lunar and solar gravity.
    D: Incorrect — currents move water but do not cause the periodic tidal rise and fall.

15. Which Indian plain is formed by the Ganges and its tributaries?
    A. Deccan Plateau
    B. Indo-Gangetic Plain
    C. Brahmaputra Valley
    D. Thar Desert
    Correct: B. Indo-Gangetic Plain
    Explanations:
    A: Incorrect — Deccan is a plateau, not a plain formed by the Ganges.
    B: Correct — the Indo-Gangetic plain is built by sediments from the Ganges and tributaries.
    C: Incorrect — Brahmaputra Valley is a separate river valley, though nearby.
    D: Incorrect — Thar is a desert, not a river-formed plain.

16. Which landform would you expect to find at the mouth of a slow-moving, sediment-rich river?
    A. Waterfall
    B. Delta
    C. Gorge
    D. Cirque
    Correct: B. Delta
    Explanations:
    A: Incorrect — waterfalls are found where rivers drop steeply, not at mouths.
    B: Correct — slow water near the mouth deposits sediments forming deltas.
    C: Incorrect — gorges are deep narrow valleys formed by erosion.
    D: Incorrect — cirques are glacial hollows in mountains.

17. Which of the following is a feature of a young fold mountain?
    A. Gentle rolling hills
    B. Very high peaks and rugged terrain
    C. Broad, flat plains
    D. Wide deltas
    Correct: B. Very high peaks and rugged terrain
    Explanations:
    A: Incorrect — gentle hills are older eroded mountains or plains.
    B: Correct — young fold mountains like the Himalaya are high and rugged.
    C: Incorrect — plains are flat lowlands, not young mountains.
    D: Incorrect — deltas are river mouth features, unrelated to mountain youth.

18. What is the function of a watershed divide?
    A. To connect two rivers
    B. To separate drainage basins
    C. To form an island
    D. To create a dune belt
    Correct: B. To separate drainage basins
    Explanations:
    A: Incorrect — divides separate rivers rather than connect them.
    B: Correct — ridges or high ground direct water to different basins; this is a watershed divide.
    C: Incorrect — islands are land surrounded by water, not drainage separators.
    D: Incorrect — dunes are wind-formed sand features, not watershed tools.

19. Which soil type is often associated with high rainfall and laterite formation?
    A. Alluvial soil
    B. Black soil
    C. Laterite soil
    D. Desert sand
    Correct: C. Laterite soil
    Explanations:
    A: Incorrect — alluvial soils are river deposits, not generally from high-rainfall weathering.
    B: Incorrect — black soils (regur) form from volcanic rocks, not directly from heavy leaching.
    C: Correct — laterite forms in hot, wet climates where intense weathering leaches minerals.
    D: Incorrect — desert sand is arid-region soil, not from high rainfall.

20. Which landform would most likely have thin soils and limited agriculture due to steep slopes?
    A. Plains
    B. Valleys
    C. Mountains
    D. Deltas
    Correct: C. Mountains
    Explanations:
    A: Incorrect — plains typically have deep fertile soils.
    B: Incorrect — valleys often have more soil and agriculture in valley floors.
    C: Correct — steep mountain slopes have thin soils and limited flat land for agriculture.
    D: Incorrect — deltas have deep fertile soils suitable for crops.

21. Which river feature forms when a meander is cut off from the main channel?
    A. Oxbow lake
    B. Gorge
    C. Floodplain
    D. U-shaped valley
    Correct: A. Oxbow lake
    Explanations:
    A: Correct — cut-off meanders form oxbow lakes.
    B: Incorrect — gorges are narrow incised valleys from erosion.
    C: Incorrect — floodplains are flat areas beside rivers, not cut-off meanders specifically.
    D: Incorrect — U-shaped valleys are glacial, not fluvial.

22. Which of the following is a major effect of deforestation on mountainous landforms?
    A. Increased deposition of coral reefs
    B. Reduced rainfall everywhere
    C. Increased risk of landslides and soil erosion
    D. Creation of deltas
    Correct: C. Increased risk of landslides and soil erosion
    Explanations:
    A: Incorrect — coral reefs are marine; deforestation doesn’t deposit corals.
    B: Incorrect — deforestation can affect local moisture but not uniformly reduce rainfall everywhere.
    C: Correct — removing vegetation destabilizes slopes, increasing landslide and erosion risk.
    D: Incorrect — deltas form from river deposition at mouths, not from mountain deforestation.

23. Which landform is commonly used for mining because it exposes older rocks?
    A. Fjords
    B. Plateaus
    C. Beaches
    D. Oxbow lakes
    Correct: B. Plateaus
    Explanations:
    A: Incorrect — fjords are deep glacial inlets, not typically mining zones.
    B: Correct — plateaus often expose ancient rock layers rich in minerals.
    C: Incorrect — beaches are sand-dominated and not mineral-rich sites for mining.
    D: Incorrect — oxbow lakes are river features, not mining hotspots.

24. Which adaptation helps people living in desert regions?
    A. Terrace farming on steep slopes
    B. Building houses with thick walls to reduce heat
    C. Relying on glaciers for water
    D. Growing rice without irrigation
    Correct: B. Building houses with thick walls to reduce heat
    Explanations:
    A: Incorrect — terrace farming suits slopes, not flat desert dunes.
    B: Correct — thick-walled houses keep interiors cooler and more habitable in deserts.
    C: Incorrect — deserts lack glaciers; people cannot rely on glacial melt.
    D: Incorrect — rice requires lots of water; deserts lack irrigation for rice cultivation typically.

25. What is an atoll?
    A. A mountain range formed by folding
    B. A ring-shaped coral island surrounding a lagoon
    C. A narrow sea channel between islands
    D. A wide delta where a large river meets the sea
    Correct: B. A ring-shaped coral island surrounding a lagoon
    Explanations:
    A: Incorrect — folding forms mountains, not atolls.
    B: Correct — atolls are coral reefs forming rings around lagoons, often on submerged volcanic bases.
    C: Incorrect — a narrow channel is a strait, not an atoll.
    D: Incorrect — deltas are sediment deposits, not coral rings.

26. Which feature indicates past glacial activity?
    A. Oxbow lakes
    B. U-shaped valleys
    C. Sand dunes
    D. Alluvial fans
    Correct: B. U-shaped valleys
    Explanations:
    A: Incorrect — oxbow lakes are fluvial features.
    B: Correct — glaciers carve broad U-shaped valleys distinct from river V-shaped valleys.
    C: Incorrect — sand dunes are wind-formed, not glacial.
    D: Incorrect — alluvial fans are river deposits at slope bases.

27. Which is the best definition of an island?
    A. A narrow ridge between two valleys
    B. Land surrounded by water on all sides
    C. A low coastal region formed by sedimentation
    D. A steep cliff formed by erosion
    Correct: B. Land surrounded by water on all sides
    Explanations:
    A: Incorrect — that describes an interfluve or ridge, not an island.
    B: Correct — islands are land entirely surrounded by water.
    C: Incorrect — low coastal regions are plains or deltas, not islands necessarily.
    D: Incorrect — cliffs are erosional features, not islands.

28. Which is a likely human activity in a coastal delta region?
    A. Alpine skiing
    B. Intensive rice cultivation
    C. Coal mining deep underground
    D. Glacier trekking
    Correct: B. Intensive rice cultivation
    Explanations:
    A: Incorrect — alpine skiing requires mountains with snow, not deltas.
    B: Correct — deltas have fertile, water-rich soils ideal for rice cultivation.
    C: Incorrect — coal mining can occur on plateaus or basins, not typically deltas.
    D: Incorrect — glacier trekking needs glaciated mountains, not deltas.

29. Which rock/soil type is associated with black cotton soil?
    A. Sandstone from river sands
    B. Basalt from volcanic lava flows
    C. Granite from deep crustal cooling
    D. Coral limestone from reefs
    Correct: B. Basalt from volcanic lava flows
    Explanations:
    A: Incorrect — river sands produce loamy/alluvial soils, not black cotton soil.
    B: Correct — black cotton soil (regur) develops from weathering of basalt lava (Deccan Traps).
    C: Incorrect — granite weathers to different soil types, not classic black cotton soil.
    D: Incorrect — coral limestone produces calcareous soils near coasts.

30. Which is the main reason many large cities developed on plains?
    A. Harsh climates
    B. Mountainous terrain for defense
    C. Fertile land and ease of transport
    D. Lack of water sources
    Correct: C. Fertile land and ease of transport
    Explanations:
    A: Incorrect — harsh climates deter large cities.
    B: Incorrect — mountainous defense may shape smaller settlements but not large urban growth.
    C: Correct — plains provide fertile soils and flat land for roads, rail and agriculture, supporting big cities.
    D: Incorrect — lack of water would prevent large cities; plains often have abundant water.

31. Which process causes the formation of cliffs along a coastline?
    A. River deposition
    B. Wave erosion
    C. Glacial deposition
    D. Wind deposition
    Correct: B. Wave erosion
    Explanations:
    A: Incorrect — deposition builds beaches and deltas, not cliffs.
    B: Correct — persistent wave action undercuts rock forming steep coastal cliffs.
    C: Incorrect — glaciers can carve cliffs inland, but coastal cliffs are mainly wave-formed.
    D: Incorrect — wind can shape dunes but typically not large coastal cliffs.

32. Which of these is an example of a river erosion landform?
    A. Alluvial plain
    B. Waterfall and gorge
    C. Coral atoll
    D. Sand dune
    Correct: B. Waterfall and gorge
    Explanations:
    A: Incorrect — alluvial plains result from deposition, not erosion.
    B: Correct — waterfalls and gorges are carved by river erosion.
    C: Incorrect — coral atolls are biological, sea-based features.
    D: Incorrect — sand dunes are wind-deposited features.

33. Which of the following indicates river deposition on a floodplain?
    A. Formation of meanders and point bars
    B. Formation of steep V-shaped valleys
    C. Collapse of river banks into deep canyons
    D. Formation of fjords
    Correct: A. Formation of meanders and point bars
    Explanations:
    A: Correct — meanders and point bars are results of lateral erosion and deposition on floodplains.
    B: Incorrect — V-shaped valleys are from vertical erosion in upper courses.
    C: Incorrect — deep canyons are erosional, not deposition features.
    D: Incorrect — fjords are glacial; not floodplain deposition.

34. Which of the following best describes a butte?
    A. A small isolated hill with steep sides and a flat top
    B. A wide flat coastal plain
    C. A long narrow river valley
    D. A circular lake in a desert
    Correct: A. A small isolated hill with steep sides and a flat top
    Explanations:
    A: Correct — buttes are isolated steep-sided hills with flat tops formed by erosion.
    B: Incorrect — a coastal plain is broad and flat, not a butte.
    C: Incorrect — narrow river valleys are gorges, not buttes.
    D: Incorrect — circular desert lakes are playas or salt pans, not buttes.

35. Why are deltas often densely populated?
    A. They are mountainous and remote
    B. They have fertile soils and abundant water
    C. They are cold and barren
    D. They lack river access
    Correct: B. They have fertile soils and abundant water
    Explanations:
    A: Incorrect — deltas are low-lying flat lands, not mountainous.
    B: Correct — rich sediments and water supply support agriculture and settlements.
    C: Incorrect — deltas are typically warm and productive, not cold and barren.
    D: Incorrect — deltas are at river mouths and have excellent river access.

36. Which feature is most likely to be found on the windward side of a mountain?
    A. Desert conditions
    B. Heavy rainfall and dense vegetation
    C. Permafrost
    D. Saline flats
    Correct: B. Heavy rainfall and dense vegetation
    Explanations:
    A: Incorrect — deserts form on leeward rain-shadow sides, not windward.
    B: Correct — moisture-laden winds rise on windward slopes causing condensation and heavy rain.
    C: Incorrect — permafrost occurs in polar or very high-altitude regions, not generally windward low mountains.
    D: Incorrect — saline flats are coastal or arid features, not typical windward mountain slopes.

37. Which of the following is a common result of sea-level rise for coastal landforms?
    A. Expansion of mountain glaciers
    B. Coastal erosion and inundation of low-lying areas
    C. Formation of new plateaus
    D. Creation of rift valleys
    Correct: B. Coastal erosion and inundation of low-lying areas
    Explanations:
    A: Incorrect — glaciers are affected by temperature, not directly sea-level rise.
    B: Correct — higher sea levels shoreward shift shorelines, causing erosion and inundation.
    C: Incorrect — plateaus form tectonically, not from sea-level changes.
    D: Incorrect — rift valleys form from tectonic extension, not sea levels.

38. Which human activity can reduce sediment supply to a river delta?
    A. Afforestation upstream
    B. Building dams upstream
    C. Controlled grazing
    D. Rainwater harvesting
    Correct: B. Building dams upstream
    Explanations:
    A: Incorrect — afforestation reduces erosion and may lower sediment but generally stabilizes soils beneficially.
    B: Correct — dams trap sediment in reservoirs, reducing downstream supply to deltas.
    C: Incorrect — uncontrolled overgrazing increases erosion and sediment, while controlled grazing reduces it.
    D: Incorrect — rainwater harvesting increases infiltration and reduces surface runoff, not directly trapping large sediments like dams do.

39. Which of these best explains the presence of a desert on the leeward side of a mountain range?
    A. Increased solar radiation there
    B. Rain-shadow effect
    C. Higher river flow on the leeward side
    D. Presence of coral reefs offshore
    Correct: B. Rain-shadow effect
    Explanations:
    A: Incorrect — solar radiation is relatively uniform; rain-shadow explains lack of moisture.
    B: Correct — mountains drop rain on windward side, leaving leeward dry (rain-shadow).
    C: Incorrect — rivers are less likely to flow on the dry leeward side.
    D: Incorrect — coral reefs offshore are unrelated to inland desert formation.

40. Which of the following is a likely effect of urbanization on natural landforms?
    A. Increased natural wetlands
    B. Reduced surface runoff
    C. Alteration of drainage patterns and increased flood risk
    D. Restoration of mountain forests
    Correct: C. Alteration of drainage patterns and increased flood risk
    Explanations:
    A: Incorrect — urbanization usually reduces wetlands via filling and development.
    B: Incorrect — urbanization increases runoff by sealing surfaces, not reducing it.
    C: Correct — paving and construction alter drainage, increase peak flows and flood risks.
    D: Incorrect — urbanization typically leads to forest loss, not restoration.

41. Which process forms sand dunes?
    A. River deposition
    B. Wind deposition
    C. Glacial carving
    D. Tectonic uplift
    Correct: B. Wind deposition
    Explanations:
    A: Incorrect — river deposition forms alluvial features, not dunes.
    B: Correct — wind transports and deposits sand to create dunes in deserts and coasts.
    C: Incorrect — glaciers carve and deposit till; dunes are aeolian (wind-formed).
    D: Incorrect — tectonics uplift land, not form dunes directly.

42. Which of the following best defines a watershed?
    A. A region where tides are highest
    B. A land area draining into a common river or outlet
    C. A high plateau with no rivers
    D. An area covered entirely by glaciers
    Correct: B. A land area draining into a common river or outlet
    Explanations:
    A: Incorrect — tides relate to coasts, not watershed definition.
    B: Correct — watershed = drainage basin feeding a common outlet.
    C: Incorrect — plateaus can be part of watersheds but not the definition.
    D: Incorrect — glacier-covered areas can be part of watersheds but not define them.

43. Which landform is an example of deposition by a glacier?
    A. Drumlin or moraine
    B. Atoll
    C. Peninsula
    D. Mesa
    Correct: A. Drumlin or moraine
    Explanations:
    A: Correct — moraines and drumlins are glacial deposits left behind by moving ice.
    B: Incorrect — atolls are biological coral formations.
    C: Incorrect — peninsulas are land connected on one side; not specifically glacial deposits.
    D: Incorrect — mesas are erosion remnants, not specifically glacial deposits.

44. What is the term for the wide, flat area along a river that floods during heavy rains?
    A. Gorge
    B. Floodplain
    C. Peninsula
    D. Butte
    Correct: B. Floodplain
    Explanations:
    A: Incorrect — gorges are narrow, steep-sided valleys.
    B: Correct — floodplains are flat adjacent areas that flood during high river discharge.
    C: Incorrect — peninsulas are land projecting into water, not flood-prone flats.
    D: Incorrect — buttes are isolated hills, not flood areas.

45. Which of the following activities is most sustainable for fragile mountain ecosystems?
    A. Unregulated logging
    B. Heavy urban expansion on steep slopes
    C. Controlled eco-tourism and regulated forestry
    D. Large-scale strip mining
    Correct: C. Controlled eco-tourism and regulated forestry
    Explanations:
    A: Incorrect — unregulated logging degrades mountain ecosystems.
    B: Incorrect — heavy expansion on steep slopes increases landslide risk and erosion.
    C: Correct — controlled tourism and regulated forestry balance livelihoods with conservation.
    D: Incorrect — strip mining is highly destructive in fragile areas.

46. Which of these is an example of a fluvial depositional landform?
    A. Esker
    B. Alluvial fan
    C. Volcano
    D. Sea stack
    Correct: B. Alluvial fan
    Explanations:
    A: Incorrect — eskers are glaciofluvial ridges from melting glaciers.
    B: Correct — alluvial fans are fan-shaped deposits at mountain bases formed by streams.
    C: Incorrect — volcanoes are igneous landforms from eruptions.
    D: Incorrect — sea stacks are erosional coastal remnants.

47. Which landform commonly supports coral reefs?
    A. Cold polar coasts
    B. Warm shallow tropical seas
    C. Deep ocean trenches
    D. Desert margins
    Correct: B. Warm shallow tropical seas
    Explanations:
    A: Incorrect — cold polar waters are unsuitable for reefs.
    B: Correct — warm, clear, shallow waters favor coral growth and reef formation.
    C: Incorrect — deep trenches are too deep and dark for corals.
    D: Incorrect — deserts are terrestrial, not coral habitats.

48. Which of the following best explains why mountain valleys are often densely settled?
    A. They have extremely high temperatures
    B. They provide flat, sheltered land with water from rivers
    C. They are isolated and lack transportation routes
    D. They are the only place with mineral resources
    Correct: B. They provide flat, sheltered land with water from rivers
    Explanations:
    A: Incorrect — mountain valleys are cooler, not extremely hot.
    B: Correct — valleys offer arable flat land and water, making them suitable for settlements.
    C: Incorrect — valleys often become transport corridors rather than being isolated.
    D: Incorrect — minerals may be elsewhere; valleys are not the sole mineral sites.

49. Which term describes a low area between hills or mountains?
    A. Plateau
    B. Valley
    C. Dune
    D. Reef
    Correct: B. Valley
    Explanations:
    A: Incorrect — plateaus are elevated flat areas, not low areas.
    B: Correct — valleys are low corridors between higher land.
    C: Incorrect — dunes are sand hills created by wind.
    D: Incorrect — reefs are marine features, not land depressions.

50. Which of the following is a likely effect of excessive groundwater withdrawal on plains?
    A. Creation of U-shaped valleys
    B. Land subsidence and lowering of water table
    C. Formation of fjords
    D. Increase in river flows permanently
    Correct: B. Land subsidence and lowering of water table
    Explanations:
    A: Incorrect — U-shaped valleys are glacial, not due to groundwater pumping.
    B: Correct — over-extraction can cause the ground to compact and water tables to drop.
    C: Incorrect — fjords are glacial in origin.
    D: Incorrect — excessive withdrawal reduces river baseflow, not increases it.

51. What causes an oxbow lake to form?
    A. Coral reef growth
    B. Volcanic eruption blocking a river
    C. Cut-off of a river meander by deposition or erosion
    D. Tectonic uplift of a riverbed
    Correct: C. Cut-off of a river meander by deposition or erosion
    Explanations:
    A: Incorrect — coral reefs are unrelated to river meanders.
    B: Incorrect — volcanic blockage is rare and not the usual cause of oxbow lakes.
    C: Correct — meanders can be cut off, leaving behind an oxbow lake.
    D: Incorrect — uplift affects course but oxbows form by meander cut-off processes.

52. Which landform is created mainly by wind action in deserts?
    A. Moraine
    B. Dune
    C. Delta
    D. Fjord
    Correct: B. Dune
    Explanations:
    A: Incorrect — moraines are glacial deposits.
    B: Correct — dunes are accumulations of sand shaped by wind.
    C: Incorrect — deltas are river deposits at mouths.
    D: Incorrect — fjords are glacially formed sea inlets.

53. Which of the following best describes the term ‘coastal erosion’?
    A. Formation of terraces inland
    B. Removal of coastal land by waves and currents
    C. Deposition of river sediment at sea
    D. Growth of coral reefs
    Correct: B. Removal of coastal land by waves and currents
    Explanations:
    A: Incorrect — terraces are inland features from various processes.
    B: Correct — coastal erosion is loss of shoreline due to wave action and currents.
    C: Incorrect — deposition at sea is not erosion.
    D: Incorrect — coral growth is biological accretion, not erosion.

54. Which is true about inland drainage?
    A. Rivers drain into the sea directly
    B. Rivers drain into lakes or basins and do not reach the sea
    C. It occurs only in coastal plains
    D. It forms coral reefs
    Correct: B. Rivers drain into lakes or basins and do not reach the sea
    Explanations:
    A: Incorrect — that’s external drainage reaching the sea.
    B: Correct — inland drainage ends in lakes, swamps or evaporative basins.
    C: Incorrect — inland drainage occurs away from coasts, often in arid interiors.
    D: Incorrect — reefs are marine features, unrelated to drainage type.

55. Which of the following is a characteristic of the Deccan Plateau?
    A. Located in northern India as part of the Himalayas
    B. Composed largely of ancient basalt lava flows (Deccan Traps)
    C. Entirely covered by rainforest similar to the Amazon
    D. A low-lying coastal plain only
    Correct: B. Composed largely of ancient basalt lava flows (Deccan Traps)
    Explanations:
    A: Incorrect — Deccan is in peninsular India, not Himalayas.
    B: Correct — the Deccan Plateau was formed from extensive lava flows producing basalt.
    C: Incorrect — it has mixed vegetation and not continuous rainforest like the Amazon.
    D: Incorrect — plateaus are elevated, not low coastal plains.

56. Which landform is most vulnerable to storm surges during cyclones?
    A. High mountain plateaus
    B. Coastal low-lying deltas and plains
    C. Inland deserts
    D. Alpine meadows
    Correct: B. Coastal low-lying deltas and plains
    Explanations:
    A: Incorrect — high plateaus are elevated above storm surge reach.
    B: Correct — low coastal areas are easily inundated by storm surges.
    C: Incorrect — deserts inland are far from coastal storm surges.
    D: Incorrect — alpine meadows are high and away from sea-level impacts.

57. Which of these is an effect of glacier retreat due to warming climate?
    A. Creation of more deltas at river mouths
    B. Loss of freshwater sources and formation of glacial lakes
    C. Expansion of coral reef habitat
    D. Immediate increase in mountain forest areas
    Correct: B. Loss of freshwater sources and formation of glacial lakes
    Explanations:
    A: Incorrect — glacier retreat does not directly increase delta formation at river mouths.
    B: Correct — retreat reduces long-term meltwater supply and can create unstable glacial lakes.
    C: Incorrect — coral reefs respond to sea temperature and acidity, not glacier retreat.
    D: Incorrect — forest expansion is complex and not an immediate result of glacier loss.

58. Which landform is generally formed by tectonic extension and sinking of a block of crust?
    A. Fold mountain
    B. Rift valley
    C. Delta
    D. Atoll
    Correct: B. Rift valley
    Explanations:
    A: Incorrect — fold mountains result from compression, not extension.
    B: Correct — rift valleys form where crustal blocks pull apart and sink.
    C: Incorrect — deltas are depositional by rivers.
    D: Incorrect — atolls are coral features, unrelated to rift valleys.

59. Which of the following helps prevent coastal erosion and protects shorelines?
    A. Deforestation of mangroves
    B. Building seawalls only
    C. Conservation and restoration of mangrove forests
    D. Removing sand from beaches
    Correct: C. Conservation and restoration of mangrove forests
    Explanations:
    A: Incorrect — deforestation of mangroves increases erosion.
    B: Incorrect — seawalls can help but often cause other problems; natural systems are more sustainable.
    C: Correct — mangroves trap sediments and reduce wave energy, protecting coasts.
    D: Incorrect — removing sand worsens beach erosion.

60. Which is NOT usually a feature of mountainous regions?
    A. High biodiversity in some regions
    B. Terrace farming
    C. Frequent landslides in unstable slopes
    D. Extensive alluvial plains suitable for large-scale rice paddies
    Correct: D. Extensive alluvial plains suitable for large-scale rice paddies
    Explanations:
    A: Incorrect — many mountain areas have high biodiversity, so this is a feature, not the answer.
    B: Incorrect — terracing is common in mountains for agriculture.
    C: Incorrect — landslides are frequent in unstable mountainous slopes.
    D: Correct — broad alluvial plains are characteristic of lowland river areas, not steep mountains.

61. Which of the following is an important human advantage of living on plains?
    A. Easier construction of transport infrastructure
    B. Better natural defenses against invaders
    C. More frequent avalanches
    D. Less fertile soils
    Correct: A. Easier construction of transport infrastructure
    Explanations:
    A: Correct — flat terrain simplifies roads, rail and urban development.
    B: Incorrect — plains offer less natural defense compared to mountains.
    C: Incorrect — avalanches occur in mountains, not plains.
    D: Incorrect — plains usually have fertile soils, not less fertile.

62. Which of the following is an example of a volcanic landform?
    A. Mesa
    B. Shield volcano
    C. Sand spit
    D. Oxbow lake
    Correct: B. Shield volcano
    Explanations:
    A: Incorrect — mesas are erosional remnants, not volcanic.
    B: Correct — shield volcanoes are formed by low-viscosity lava flows building gentle slopes.
    C: Incorrect — sand spits are coastal depositional features.
    D: Incorrect — oxbow lakes are formed by river meander cut-offs.

63. Which human activity tends to increase flood risk in plains?
    A. Maintaining wetlands and natural floodplains
    B. Planting more trees along riverbanks
    C. Urban expansion onto floodplains and paving surfaces
    D. Building upstream retention ponds
    Correct: C. Urban expansion onto floodplains and paving surfaces
    Explanations:
    A: Incorrect — maintaining wetlands reduces flood risk.
    B: Incorrect — riparian trees stabilize banks and reduce floods.
    C: Correct — developing floodplains and sealing ground increases runoff and flood risk.
    D: Incorrect — retention ponds help manage floods.

64. Which process most directly creates an alluvial fan?
    A. River flowing from steep mountains to flat plains and depositing sediment
    B. Coral growth in shallow seas
    C. Wind transporting silt across oceans
    D. Glacial plucking of bedrock
    Correct: A. River flowing from steep mountains to flat plains and depositing sediment
    Explanations:
    A: Correct — when a stream exits a steep valley onto a plain, its flow spreads and deposits sediments forming an alluvial fan.
    B: Incorrect — coral growth forms reefs, not alluvial fans.
    C: Incorrect — wind may form loess deposits, not typical alluvial fans.
    D: Incorrect — glacial plucking creates different depositional features, not fans from fluvial action.

65. Why are coastal wetlands like mangroves important for fisheries?
    A. They decrease fish nursery habitats
    B. They act as nurseries and feeding grounds for many fish species
    C. They poison saltwater making fishing impossible
    D. They are purely decorative landscapes
    Correct: B. They act as nurseries and feeding grounds for many fish species
    Explanations:
    A: Incorrect — they increase nursery habitats rather than decrease them.
    B: Correct — mangroves provide shelter and food for juvenile fish, boosting fisheries.
    C: Incorrect — mangroves do not poison saltwater; they improve productivity.
    D: Incorrect — they provide critical ecosystem services beyond aesthetics.

66. What is meant by ‘land subsidence’?
    A. The rise of mountain peaks
    B. The sinking of the ground surface, often due to groundwater withdrawal
    C. The formation of new islands from lava
    D. The spread of desert dunes into farmland
    Correct: B. The sinking of the ground surface, often due to groundwater withdrawal
    Explanations:
    A: Incorrect — rise of peaks is uplift, not subsidence.
    B: Correct — subsidence occurs when underlying materials compact, often after excess groundwater pumping.
    C: Incorrect — island formation from lava is volcanic growth, not sinking.
    D: Incorrect — dune encroachment is desertification, not subsidence.

67. Which of the following best describes a ria?
    A. A submerged river valley forming an estuary-like inlet
    B. A volcanic crater filled with water
    C. A man-made canal connecting two seas
    D. A glacial depositional ridge
    Correct: A. A submerged river valley forming an estuary-like inlet
    Explanations:
    A: Correct — rias are drowned river valleys common on irregular coastlines.
    B: Incorrect — crater lakes are volcanic, not rias.
    C: Incorrect — canals are man-made; rias are natural features.
    D: Incorrect — depositional ridges from glaciers are moraines, not rias.

68. Which of the following physical features is most likely to cause a river to meander?
    A. A very steep gradient in the upper course
    B. A gentle gradient and abundant sediment in the middle or lower course
    C. A long stretch of glacier-fed river frozen year-round
    D. A narrow bedrock channel with little sediment
    Correct: B. A gentle gradient and abundant sediment in the middle or lower course
    Explanations:
    A: Incorrect — steep gradients cause straight, fast-flowing channels, not meanders.
    B: Correct — low slope and sediment promote lateral erosion forming meanders.
    C: Incorrect — frozen rivers don’t form classic meanders.
    D: Incorrect — narrow bedrock channels limit lateral movement and meandering.

69. Which of the following best explains why mangrove forests are usually found in tropical coastal regions?
    A. They require cold waters and sea ice
    B. They thrive in warm, sheltered, low-energy tidal zones with brackish water
    C. They only grow on rocky, wave-battered coasts
    D. They grow best in high alpine areas
    Correct: B. They thrive in warm, sheltered, low-energy tidal zones with brackish water
    Explanations:
    A: Incorrect — mangroves cannot tolerate sea ice or cold waters.
    B: Correct — mangroves are adapted to warm, sheltered, saline-brackish coastal conditions.
    C: Incorrect — wave-battered rocky coasts are unsuitable for mangroves which prefer sediment-rich sheltered areas.
    D: Incorrect — alpine areas are cold and unsuitable.

70. Which of the following would most likely increase soil salinity in agricultural plains?
    A. Excessive irrigation without proper drainage
    B. Planting deep-rooted trees
    C. Building rainwater harvesting systems
    D. Reducing fertilizer use
    Correct: A. Excessive irrigation without proper drainage
    Explanations:
    A: Correct — excess irrigation raises groundwater and brings salts to the root zone, increasing salinity.
    B: Incorrect — deep-rooted trees can help lower water table and reduce salinity in some cases.
    C: Incorrect — rainwater harvesting supports freshwater availability and can reduce salinity risk.
    D: Incorrect — fertilizer changes nutrient levels but salinity is mainly about salts from water.

71. Which of the following landforms is most likely to be formed from old lava flows?
    A. Karst limestone features
    B. Basaltic plateaus (like Deccan Traps)
    C. Sand dunes
    D. Oxbow lakes
    Correct: B. Basaltic plateaus (like Deccan Traps)
    Explanations:
    A: Incorrect — karst forms from limestone dissolution, not lava.
    B: Correct — extensive basalt lava flows create plateaus like the Deccan Traps.
    C: Incorrect — dunes are wind-formed, not volcanic.
    D: Incorrect — oxbow lakes are riverine features.

72. Which of these is a primary indicator of a young, rugged mountain landscape?
    A. Gentle rolling plains
    B. Deep river gorges and sharp peaks
    C. Wide coastal deltas
    D. Extensive alluvial fans
    Correct: B. Deep river gorges and sharp peaks
    Explanations:
    A: Incorrect — gentle plains indicate old, eroded landscapes.
    B: Correct — young mountains are sharp and rugged with deep incision by rivers.
    C: Incorrect — deltas are lowland coastal features.
    D: Incorrect — alluvial fans are depositional at mountain fronts, not direct youth indicators.

73. Which human intervention can help recharge groundwater in plateau regions?
    A. Building large unlined canals that lose water to evaporation only
    B. Percolation tanks and check dams to enhance infiltration
    C. Removing vegetation across catchments
    D. Paving over recharge zones
    Correct: B. Percolation tanks and check dams to enhance infiltration
    Explanations:
    A: Incorrect — unlined canals may waste water but do not necessarily promote recharge.
    B: Correct — small structures slow runoff and increase infiltration, recharging aquifers.
    C: Incorrect — removing vegetation reduces infiltration and increases runoff.
    D: Incorrect — paving prevents infiltration and reduces groundwater recharge.

74. Which of the following best explains why the Indo-Gangetic Plain is agriculturally productive?
    A. Steep slopes and sparse soils
    B. Fertile alluvial soils and abundant river water for irrigation
    C. High altitude and cold climate
    D. Predominant desert conditions
    Correct: B. Fertile alluvial soils and abundant river water for irrigation
    Explanations:
    A: Incorrect — steep slopes hinder intensive agriculture.
    B: Correct — regular silt deposition and rivers provide fertile soils and irrigation.
    C: Incorrect — high altitude and cold climates are not suitable for the typical crops of the plain.
    D: Incorrect — the Indo-Gangetic plain is not a desert.

75. Which of the following is an advantage of living near a river valley?
    A. Lack of freshwater
    B. Access to fertile soil, irrigation and transport
    C. Constant risk of volcanic eruption
    D. Permafrost conditions year-round
    Correct: B. Access to fertile soil, irrigation and transport
    Explanations:
    A: Incorrect — river valleys usually have abundant freshwater.
    B: Correct — valleys provide water, fertile soils, and navigation routes.
    C: Incorrect — volcanic risk is specific to volcanic regions, not general river valleys.
    D: Incorrect — permafrost is for polar regions and high latitudes.

76. Which of the following describes an estuary?
    A. A freshwater lake in the mountains
    B. A coastal area where river meets sea and freshwater mixes with saltwater
    C. A desert lake with no outflow
    D. A glacial valley filled with ice
    Correct: B. A coastal area where river meets sea and freshwater mixes with saltwater
    Explanations:
    A: Incorrect — mountain lakes are freshwater and enclosed.
    B: Correct — estuaries are brackish zones of mixing and high productivity.
    C: Incorrect — desert lakes are typically endorheic basins, not estuaries.
    D: Incorrect — glacial valleys filled with ice are glaciers, not estuaries.

77. Which landform is commonly associated with high biodiversity and endemism in India?
    A. Thar Desert
    B. Western Ghats
    C. Indo-Gangetic floodplain only
    D. Arid plateaus exclusively
    Correct: B. Western Ghats
    Explanations:
    A: Incorrect — deserts have unique species but not the highest endemic biodiversity in India.
    B: Correct — the Western Ghats are a biodiversity hotspot with many endemic species.
    C: Incorrect — floodplains are productive but not typically cited as the top endemic hotspot relative to Western Ghats.
    D: Incorrect — arid plateaus have limited biodiversity compared to Western Ghats.

78. Why are mountain passes important historically?
    A. They provide natural harbors for ships
    B. They block all movement between regions
    C. They provide routes through mountain ranges for trade and migration
    D. They are ideal for large-scale flat farming
    Correct: C. They provide routes through mountain ranges for trade and migration
    Explanations:
    A: Incorrect — passes are land routes, not harbors.
    B: Incorrect — passes enable, rather than block, movement.
    C: Correct — passes are lower points that facilitate crossing mountains for trade and cultural exchange.
    D: Incorrect — passes are narrow and rocky, unsuitable for extensive farming.

79. Which of the following is a major human hazard specifically linked to living on steep mountain slopes?
    A. Tsunamis
    B. Landslides
    C. Cyclones only
    D. Salinity intrusion
    Correct: B. Landslides
    Explanations:
    A: Incorrect — tsunamis affect coasts, not steep mountains.
    B: Correct — slope instability, heavy rain or earthquakes trigger landslides on steep slopes.
    C: Incorrect — cyclones affect coasts; mountains may be indirectly affected by rainfall.
    D: Incorrect — salinity intrusion affects coasts and groundwater near seas, not mountain slopes.

80. Which of the following best defines a canyon?
    A. A broad flat plain with many lakes
    B. A deep, narrow valley with steep sides carved by river erosion
    C. A small sand hill formed by wind
    D. A coral reef lagoon
    Correct: B. A deep, narrow valley with steep sides carved by river erosion
    Explanations:
    A: Incorrect — plains are broad and flat, opposite of canyons.
    B: Correct — canyons are erosional valleys typically carved by rivers.
    C: Incorrect — small sand hills are dunes, not canyons.
    D: Incorrect — coral lagoons are marine, not canyons.

81. Which of the following is an effect of building large dams on rivers?
    A. Increased downstream sediment deposition in deltas
    B. Trapping of sediments upstream and reduced sediment supply downstream
    C. Complete prevention of earthquakes
    D. Immediate increase in coastal land area
    Correct: B. Trapping of sediments upstream and reduced sediment supply downstream
    Explanations:
    A: Incorrect — dams trap sediment, reducing downstream deposition.
    B: Correct — reservoirs capture sediments, starving downstream deltas and floodplains.
    C: Incorrect — dams do not prevent earthquakes and might induce seismicity in rare cases.
    D: Incorrect — dams do not increase coastal land; reduced sediment can cause coastal erosion.

82. Which landform is formed by the convergence and collision of tectonic plates?
    A. Mid-ocean ridge
    B. Fold mountain ranges
    C. Long sand dunes
    D. Coral atolls
    Correct: B. Fold mountain ranges
    Explanations:
    A: Incorrect — mid-ocean ridges form at divergent boundaries where plates spread apart.
    B: Correct — fold mountains form where plates collide and crumple the crust.
    C: Incorrect — dunes are aeolian features, not tectonic.
    D: Incorrect — atolls develop from coral growth on submerged volcanoes.

83. Which of the following areas is most likely to have permafrost?
    A. Tropical rainforest
    B. Arctic tundra
    C. Desert oasis
    D. Coastal mangrove
    Correct: B. Arctic tundra
    Explanations:
    A: Incorrect — tropical climates are too warm for permafrost.
    B: Correct — permafrost (permanently frozen ground) is typical in polar tundra regions.
    C: Incorrect — desert oases are not permafrost areas.
    D: Incorrect — mangroves are tropical/subtropical, not permafrost zones.

84. Which landform provides natural protection against storm surge and cyclones when preserved?
    A. Sandstone cliffs cleared of vegetation
    B. Mangrove forests along the shoreline
    C. Paved seafront promenades
    D. Large concrete seawalls only
    Correct: B. Mangrove forests along the shoreline
    Explanations:
    A: Incorrect — cliffs without vegetation may erode and do not provide the same buffering as mangroves.
    B: Correct — mangroves attenuate wave energy and trap sediments, protecting coasts.
    C: Incorrect — paved promenades do not absorb wave energy as effectively.
    D: Incorrect — seawalls can help but can be costly and may cause other problems; mangroves provide ecological benefits too.

85. Which of the following is an example of a human adaptation to living in mountainous regions?
    A. Building homes from ice everywhere
    B. Terrace agriculture to create flat fields on slopes
    C. Growing rice in flooded paddies in high alpine zones
    D. Harvesting coral reefs inland
    Correct: B. Terrace agriculture to create flat fields on slopes
    Explanations:
    A: Incorrect — building from ice (iglús) is Arctic practice, not general mountain adaptation.
    B: Correct — terraces reduce erosion and make slope farming possible.
    C: Incorrect — flooded rice paddies require flat land and water, not typical of high alpine zones.
    D: Incorrect — coral reefs are marine, not inland mountain resources.

86. Which of the following is most likely to increase soil erosion on slopes?
    A. Planting cover crops and vegetation
    B. Constructing contour bunds and terraces
    C. Deforestation and removal of vegetation cover
    D. Building small check dams to slow runoff
    Correct: C. Deforestation and removal of vegetation cover
    Explanations:
    A: Incorrect — cover crops protect soil from erosion.
    B: Incorrect — contour bunding and terraces reduce erosion.
    C: Correct — removing vegetation leaves soil exposed to rain splash and runoff, increasing erosion.
    D: Incorrect — check dams slow water and reduce erosion downstream.

87. Which of the following best describes an oxbow lake’s origin?
    A. It forms in volcanic craters when they fill with water
    B. It forms when coastal winds seal off a bay
    C. It forms from a meander that has been cut off from a river channel
    D. It forms through glacial melting in valleys
    Correct: C. It forms from a meander that has been cut off from a river channel
    Explanations:
    A: Incorrect — crater lakes are volcanic, not oxbow lakes.
    B: Incorrect — coastal bays differ from oxbows.
    C: Correct — oxbow lakes result from meander cutoff processes in rivers.
    D: Incorrect — glacial lakes form by ice processes, not meanders.

88. Which of these landforms is most suitable for building large airports and industrial complexes?
    A. Steep mountain slopes
    B. Flat plains and plateaus with gentle relief
    C. Narrow river gorges
    D. Coral atolls with limited land area
    Correct: B. Flat plains and plateaus with gentle relief
    Explanations:
    A: Incorrect — steep slopes are unsuitable for runways and large facilities.
    B: Correct — flat areas enable large, level construction necessary for airports and industry.
    C: Incorrect — gorges are narrow and not fit for large-scale construction.
    D: Incorrect — atolls have limited, fragile land not ideal for heavy infrastructure.

89. Which of the following best explains how coastal plains form?
    A. By lava flows building high plateaus
    B. By tectonic collision building mountains
    C. By sediment deposition and sea-level changes along the coast
    D. By wind erosion alone
    Correct: C. By sediment deposition and sea-level changes along the coast
    Explanations:
    A: Incorrect — lava flows produce plateaus, not coastal plains.
    B: Incorrect — collisions form mountains, not coastal plains.
    C: Correct — coasts accrete sediment and respond to sea-level shifts, forming plains.
    D: Incorrect — wind alone shapes dunes, not broad coastal plains.

90. Which of the following is most likely to be a problem for agriculture in a desert region?
    A. Excess moisture and waterlogging
    B. Salinity and severe water scarcity
    C. Constant heavy rainfall
    D. Very fertile soil everywhere
    Correct: B. Salinity and severe water scarcity
    Explanations:
    A: Incorrect — deserts lack excess moisture; waterlogging is rare.
    B: Correct — deserts face lack of water and often salt accumulation where irrigation is used poorly.
    C: Incorrect — deserts have low rainfall, not heavy rain.
    D: Incorrect — desert soils are typically poor and not uniformly fertile.

91. Which is the main reason the Western Ghats are ecologically important?
    A. They are covered entirely by desert
    B. They are a biodiversity hotspot with many endemic species
    C. They are the world’s largest delta
    D. They are flat plains used for rice cultivation only
    Correct: B. They are a biodiversity hotspot with many endemic species
    Explanations:
    A: Incorrect — Western Ghats are wet and forested, not a desert.
    B: Correct — high rainfall and varied topography create unique habitats and endemism.
    C: Incorrect — deltas are river mouth features, not Ghats.
    D: Incorrect — Ghats are mountainous, not flat plains for rice only.

92. Which of the following is an effect of soil erosion on agricultural plains?
    A. Increased fertility everywhere
    B. Loss of topsoil, reduced productivity and siltation of rivers
    C. Formation of U-shaped valleys
    D. Creation of atolls
    Correct: B. Loss of topsoil, reduced productivity and siltation of rivers
    Explanations:
    A: Incorrect — erosion removes fertile topsoil rather than increase fertility.
    B: Correct — erosion depletes productive soil and adds silt to waterways.
    C: Incorrect — U-shaped valleys are glacial, not erosion by agriculture.
    D: Incorrect — atolls are coral islands, unrelated to soil erosion.

93. Which is the correct sequence of river processes from source to mouth?
    A. Deposition → Erosion → Transport
    B. Erosion → Transport → Deposition
    C. Transport → Deposition → Erosion
    D. Uplift → Subsidence → Folding
    Correct: B. Erosion → Transport → Deposition
    Explanations:
    A: Incorrect — deposition is usually final, not first.
    B: Correct — rivers erode at the source/top, carry (transport) material, then deposit it near lower courses or mouth.
    C: Incorrect — order is incorrect for typical fluvial processes.
    D: Incorrect — uplift, subsidence and folding are tectonic processes, not river sequence.

94. What human measure can help reduce landslide risk in hilly areas?
    A. Removing tree cover on slopes
    B. Building houses on unstable slopes without foundations
    C. Planting deep-rooted vegetation and engineering slope stabilization
    D. Overgrazing by livestock
    Correct: C. Planting deep-rooted vegetation and engineering slope stabilization
    Explanations:
    A: Incorrect — removing trees increases landslide risk.
    B: Incorrect — building on unstable slopes increases risk of failure.
    C: Correct — roots bind soil and engineering measures stabilize slopes and reduce landslides.
    D: Incorrect — overgrazing removes protective vegetation, worsening slope instability.

95. Which of the following best explains why ocean currents influence coastal climate?
    A. They change the Earth’s axis
    B. They move heat energy from one region to another, warming or cooling coasts
    C. They create mountains in the ocean
    D. They cause tectonic uplift of coasts
    Correct: B. They move heat energy from one region to another, warming or cooling coasts
    Explanations:
    A: Incorrect — currents do not alter Earth’s axial tilt.
    B: Correct — warm currents warm nearby coasts; cold currents cool them, affecting local climate.
    C: Incorrect — currents do not create mountains.
    D: Incorrect — tectonic uplift is unrelated to ocean currents.

96. Which landform would you associate with ancient coral reef growth around a sinking volcanic island?
    A. Peninsula
    B. Atoll
    C. Mesa
    D. Butte
    Correct: B. Atoll
    Explanations:
    A: Incorrect — a peninsula is land projecting into water, not a coral ring.
    B: Correct — atolls form from coral growth on subsiding volcanic islands leaving a ring.
    C: Incorrect — mesas are flat-topped inland hills from erosion.
    D: Incorrect — buttes are isolated hills, not coral formations.

97. Which of the following is a major cause of desertification?
    A. Sustainable grazing and agroforestry
    B. Deforestation, overgrazing, and poor land management
    C. Planting trees and restoring soils
    D. Building check dams and recharge structures
    Correct: B. Deforestation, overgrazing, and poor land management
    Explanations:
    A: Incorrect — sustainable grazing and agroforestry reduce desertification, not cause it.
    B: Correct — removing vegetation and poor practices degrade soils leading to desertification.
    C: Incorrect — planting trees helps prevent desertification.
    D: Incorrect — check dams help retain water and reduce degradation.

98. Which of the following coastal features results from longshore drift and deposition of sand along a shoreline?
    A. Spit or sandbar
    B. Fjord
    C. Drumlin
    D. Oxbow lake
    Correct: A. Spit or sandbar
    Explanations:
    A: Correct — longshore currents transport sand and deposit features like spits and bars along coasts.
    B: Incorrect — fjords are glacially formed inlets.
    C: Incorrect — drumlins are glaciofluvial hills.
    D: Incorrect — oxbow lakes are fluvial features inland.

99. Which of the following statements is true about the Thar Desert?
    A. It receives heavy monsoon rainfall year-round
    B. It is located in western India and has sand dunes and arid conditions
    C. It is covered mainly by glaciers
    D. It is the wettest region of India
    Correct: B. It is located in western India and has sand dunes and arid conditions
    Explanations:
    A: Incorrect — the Thar has low and erratic rainfall, not heavy year-round monsoons.
    B: Correct — the Thar Desert in northwest India/Pakistan is arid with dunes and sparse vegetation.
    C: Incorrect — glaciers are in high mountains, not the Thar.
    D: Incorrect — it is among the driest, not wettest, regions.

100. Which of the following is a sustainable practice to protect river banks and reduce erosion?
     A. Removing vegetation from banks to create more space
     B. Planting riparian vegetation and using bioengineering techniques
     C. Channelizing rivers with concrete only, without vegetation
     D. Dredging continuously without revegetation
     Correct: B. Planting riparian vegetation and using bioengineering techniques
     Explanations:
     A: Incorrect — removing vegetation increases erosion risk.
     B: Correct — riparian plants stabilize banks and bioengineering (live fascines, coir logs) reduces erosion sustainably.
     C: Incorrect — concrete channelization can worsen downstream impacts and reduce ecological value.
     D: Incorrect — dredging alone does not address bank stability; vegetation is needed for long-term control.

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