Diversity in Living World Part 2: MCQs (Q26–Q50)
Part 2 — Questions 26–50 (More on animal groups, habitat & adaptations)
26. Amphibians are unique because they:
A. Live only on land.
B. Live both in water and on land during their life cycle (e.g., frog tadpole → adult). ← Correct answer: B
C. Are always warm-blooded.
D. Have feathers.
Explanations:
A/C/D) Incorrect — amphibians have aquatic juvenile stages and are cold-blooded without feathers.
B) Correct — amphibians typically have metamorphosis from water breathing larvae to terrestrial adults.
27. Which animal is an example of an arthropod?
A. Earthworm.
B. Octopus.
C. Spider. ← Correct answer: C
D. Frog.
Explanations:
A) Earthworm is an annelid.
B) Octopus is a mollusc (cephalopod).
C) Correct — spiders belong to arthropods (jointed legs, exoskeleton).
D) Frog is amphibian (not arthropod).
28. Which adaptation helps desert plants conserve water?
A. Large broad leaves with many stomata.
B. Thick fleshy stems/leaves (succulence) and reduced leaves. ← Correct answer: B
C. Constantly open stomata day and night.
D. Thin cuticle.
Explanations:
A/C/D) Incorrect — broad leaves/open stomata/thin cuticle increase water loss.
B) Correct — succulents store water and reduce leaf area to minimize transpiration.
29. Which group of animals lays eggs with hard shells and has feathers?
A. Reptiles.
B. Birds. ← Correct answer: B
C. Mammals.
D. Fish.
Explanations:
A) Reptiles lay eggs but have scales, not feathers.
B) Correct — birds lay hard-shelled eggs and have feathers.
C) Mammals mostly give birth to live young (except monotremes).
D) Fish lay eggs but have fins and gills, not feathers.
30. Which of the following pairs is CORRECTLY matched (animal — habitat)?
A. Shark — desert.
B. Camel — Arctic.
C. Penguin — Antarctic / cold regions. ← Correct answer: C
D. Fish — mountains.
Explanations:
A/B/D) Incorrect — sharks live in oceans, camels in deserts, fish in water.
C) Correct — penguins are adapted to cold marine environments like Antarctica.
31. Sponges (Porifera) are simple animals because they:
A. Have complex organs like heart and brain.
B. Have porous bodies with no true tissues or organs. ← Correct answer: B
C. Are plants not animals.
D. Fly in the air.
Explanations:
A) Incorrect — sponges lack complex organs.
B) Correct — sponges have porous bodies and simple organization.
C/D) Incorrect.
32. Which of the following is an example of a mollusc?
A. Centipede.
B. Snail. ← Correct answer: B
C. Earthworm.
D. Spider.
Explanations:
A) Centipedes are arthropods.
B) Correct — snails are molluscs (soft body, often with a shell).
C) Earthworm is annelid.
D) Spider is arthropod.
33. Which statement about insects is TRUE?
A. Insects have four pairs of legs.
B. Insects have three pairs of legs and body divided into head, thorax and abdomen. ← Correct answer: B
C. Insects have a backbone.
D. All insects are aquatic.
Explanations:
A) Incorrect — spiders have four pairs; insects have three pairs.
B) Correct — standard insect body plan is head-thorax-abdomen with six legs.
C/D) Incorrect.
34. Which bird adaptation helps it swim efficiently in water?
A. Hollow bones only.
B. Webbed feet. ← Correct answer: B
C. Wings with feathers unsuitable for water.
D. Scales.
Explanations:
A) Hollow bones aid flight but not swimming specifically.
B) Correct — webbed feet act like paddles for swimming (ducks).
C/D) Incorrect.
35. Which animal shows parental care by feeding young with milk?
A. Lizard.
B. Cow. ← Correct answer: B
C. Hen.
D. Fish.
Explanations:
A/C/D) Incorrect — lizards/hen/fish do not feed young with milk.
B) Correct — cows are mammals and feed young with milk produced by mammary glands.
36. Animals have different modes of locomotion. Which is characteristic of snakes?
A. Flying.
B. Swimming only.
C. Slithering without limbs. ← Correct answer: C
D. Walking on two legs.
Explanations:
A/B/D) Incorrect.
C) Correct — snakes move by lateral undulation and body muscles (slithering).
37. Which of the following is a nocturnal animal (active at night)?
A. Sparrow.
B. Owl. ← Correct answer: B
C. Bee.
D. Butterfly.
Explanations:
A/C/D) Incorrect — sparrow/bee/butterfly are mostly day-active.
B) Correct — owls are primarily nocturnal hunters.
38. Which animal helps in pollination by carrying pollen from flower to flower?
A. Ants only.
B. Earthworms only.
C. Bees, butterflies, birds (many pollinators). ← Correct answer: C
D. Fish only.
Explanations:
A/B/D) Incorrect or limited — ants sometimes pollinate but are not the main pollinators; earthworms/fish do not pollinate flowers.
C) Correct — bees, butterflies and some birds are important pollinators.
39. Which feature distinguishes mammals from other vertebrates?
A. Wings.
B. Scales.
C. Presence of hair and mammary glands. ← Correct answer: C
D. Gills for breathing.
Explanations:
A/B/D) Incorrect — wings are in birds/bats; scales in reptiles/fishes; gills in fish.
C) Correct — hair and milk-producing mammary glands are mammalian features.
40. Which is an example of an aquatic mammal?
A. Tiger.
B. Dolphin. ← Correct answer: B
C. Eagle.
D. Frog (amphibian).
Explanations:
A/C) Incorrect — tiger and eagle are terrestrial/avian.
B) Correct — dolphins are mammals adapted to live in water.
D) Frog is amphibian, not a mammal.
41. Which adaptation helps cactus survive in dry climates?
A. Broad leaves for transpiration.
B. Spines (reduced leaves) and thick succulent stem for water storage. ← Correct answer: B
C. Many stomata open all day.
D. Thin cuticle.
Explanations:
A/C/D) Incorrect — broad leaves and open stomata increase water loss; thin cuticle increases evaporation.
B) Correct — cactus adaptations reduce water loss and store water.
42. Which animal group has a three-chambered heart (in most members)?
A. Mammals (four-chambered).
B. Birds (four-chambered).
C. Amphibians and most reptiles (three-chambered). ← Correct answer: C
D. Fishes (two-chambered).
Explanations:
A/B/D) Incorrect descriptions for those groups.
C) Correct — amphibians and many reptiles have a three-chambered heart (two atria, one ventricle), with exceptions (crocodiles have 4).
43. Which of the following animals shows metamorphosis (dramatic body change during life cycle)?
A. Human.
B. Butterfly (egg→larva/caterpillar→pupa→adult). ← Correct answer: B
C. Cow.
D. Shark.
Explanations:
A/C/D) Incorrect — humans, cows, sharks do not undergo metamorphosis like insects/amphibians.
B) Correct — butterflies undergo complete metamorphosis.
44. Which of these animals is herbivorous (feeds on plants)?
A. Lion.
B. Cow. ← Correct answer: B
C. Tiger.
D. Eagle.
Explanations:
A/C/D) Incorrect — lion/tiger/eagle are carnivores (meat eaters).
B) Correct — cows graze on grass (herbivores).
45. Which adaptation suits animals living in cold regions?
A. Thin skin and no fat.
B. Thick fur/blubber for insulation. ← Correct answer: B
C. No food storage.
D. Bright flowers.
Explanations:
A/C/D) Incorrect — thin skin/blubber absence are maladaptive for cold; bright flowers relate to plants.
B) Correct — fur or blubber helps retain heat in cold climates.
46. Which insect undergoes incomplete metamorphosis (young resemble adults somewhat)?
A. Butterfly (complete).
B. Grasshopper (egg→nymph→adult). ← Correct answer: B
C. Moth (complete).
D. Beetle (complete for many).
Explanations:
A/C/D) Incorrect — these undergo complete metamorphosis (egg→larva→pupa→adult) or diverse.
B) Correct — grasshoppers have nymphs that look like small adults (incomplete metamorphosis).
47. Which of the following is an example of camouflage used as protection?
A. Bright colours to attract predators.
B. A stick insect looking like a twig so predators do not detect it. ← Correct answer: B
C. Loud noises to scare away mates.
D. Reflective armour to shine.
Explanations:
A/C/D) Incorrect — bright colours often warn or attract; loud noises are different strategies.
B) Correct — camouflage helps avoid detection by blending with environment.
48. Which animal has a pouch to carry its young (marsupial)?
A. Horse.
B. Kangaroo. ← Correct answer: B
C. Elephant.
D. Goat.
Explanations:
A/C/D) Incorrect — horses/elephants/goats are placental mammals.
B) Correct — kangaroos are marsupials with pouches for joeys.
49. Which bird is flightless and adapted for running?
A. Sparrow.
B. Eagle.
C. Ostrich. ← Correct answer: C
D. Crow.
Explanations:
A/B/D) Incorrect — sparrow/eagle/crow can fly.
C) Correct — ostriches are large, flightless birds adapted for running.
50. Which feature helps aquatic animals maintain buoyancy?
A. Lungs for all fishes.
B. Swim bladder in many bony fishes. ← Correct answer: B
C. Feathers for fish.
D. Fur coat.
Explanations:
A) Incorrect — fishes use gills to respire; lungs are not universal in fishes.
B) Correct — swim bladder adjusts buoyancy in bony fishes.
C/D) Incorrect — feathers/fur are for birds/mammals, not for fish buoyancy.