Nature’s Treasures – MCQs with Answers and Explanations
Nature's Treasures — 40 MCQs with Answers & Explanations
Topic-wise multiple choice questions with clear explanations. Prepared strictly as per NCERT and ideal for CBSE Class 6 revision and exam practice.
Which of the following is NOT a natural resource?
Explanation: Plastic is a man-made synthetic material derived from petrochemicals; it is not directly provided by nature.
Which term describes resources that can be replaced naturally within a short time?
Explanation: Renewable resources (like sunlight, wind, water) are replenished naturally within short timescales.
Which of these is a non-renewable resource?
Explanation: Coal is formed over millions of years from plant remains and cannot be replenished quickly.
Which practice helps conserve natural resources?
Explanation: Recycling reduces the need for extraction of new raw materials, saving resources and energy.
Why is it important to conserve resources?
Explanation: Conservation maintains resource availability and ecological balance for future needs.
Which process in water cycle converts water to water vapour?
Explanation: Evaporation is the change from liquid water to vapour due to heat.
Which is a method to conserve water in agriculture?
Explanation: Drip irrigation supplies water directly to roots, reducing evaporation and wastage.
Rainwater harvesting helps by:
Explanation: Collecting rainwater allows it to seep and replenish groundwater levels.
Which is a major cause of water pollution?
Explanation: Untreated industrial waste contains harmful chemicals that contaminate water bodies.
Which source provides freshwater that is often safe to drink after treatment?
Explanation: Rivers and lakes are freshwater sources and with proper treatment provide potable water.
Which of these stores the largest amount of freshwater on Earth?
Explanation: Most freshwater is stored as ice in glaciers and polar ice caps, far more than rivers or groundwater.
Which action will NOT help conserve water?
Explanation: Using a running hose wastes large amounts of water; using a bucket is better.
Which of these is a consequence of excessive groundwater extraction?
Explanation: Excessive pumping drops water table and can cause the land to sink (subsidence).
Which gas is most abundant in air?
Explanation: Nitrogen makes up about 78% of Earth's atmosphere.
Which pollutant mainly causes acid rain?
Explanation: Sulphur dioxide and nitrogen oxides react with water vapour to form acidic compounds causing acid rain.
Which of these is NOT an effect of air pollution?
Explanation: Air pollution harms plants and reduces photosynthesis; it does not enhance it.
Planting trees helps reduce air pollution because they:
Explanation: Trees capture particulate matter and take up CO2, helping clean the air.
Which practice contributes least to reducing air pollution?
Explanation: Open burning releases smoke and pollutants; it increases air pollution.
Smog is a combination of smoke and:
Explanation: Smog forms when smoke and pollutants mix with fog or moisture in the air, reducing visibility.
Which domestic change can reduce indoor air pollution?
Explanation: Clean cooking fuels and adequate ventilation lower harmful indoor smoke and gases.
Which soil type drains water fastest?
Explanation: Sandy soil has large particles and large spaces which allow quick drainage.
Which soil is best for farming most crops?
Explanation: Loamy soil balances sand, silt and clay, retaining nutrients and water while allowing aeration.
Which practice helps prevent soil erosion on slopes?
Explanation: Terracing reduces runoff speed and helps retain soil on slopes.
Adding compost to soil primarily improves:
Explanation: Compost adds organic matter, nutrients and improves texture and water retention.
What is topsoil?
Explanation: Topsoil contains organic matter and nutrients needed for plant growth.
Which of these reduces soil fertility?
Explanation: Excessive chemical fertilisers can damage soil microbes and reduce long-term fertility.
Which metal is commonly used to make steel?
Explanation: Iron is alloyed with carbon to produce steel, a key construction material.
What is the main environmental concern with mining?
Explanation: Mining often disturbs land, creates waste and pollutes water and air if not managed properly.
Which practice conserves mineral resources?
Explanation: Recycling reduces the need for fresh extraction and conserves finite mineral resources.
Which of these is a non-metal mineral?
Explanation: Mica is a non-metallic mineral used in electrical appliances and insulation.
Plants are important because they:
Explanation: Through photosynthesis, plants make food and release oxygen essential for life.
Which plant part helps prevent soil erosion?
Explanation: Roots bind soil particles, reducing erosion by wind and water.
Photosynthesis requires all except:
Explanation: Photosynthesis uses CO2, water and sunlight to produce glucose and oxygen as a byproduct.
Which is a useful plant product used in medicines?
Explanation: Neem has antiseptic and medicinal properties and is used traditionally for health remedies.
Which action helps increase plant diversity in a garden?
Explanation: Native species support local wildlife and maintain ecological balance, increasing biodiversity.
Which human activity directly causes deforestation?
Explanation: Logging removes trees and can lead to large-scale deforestation if unregulated.
Which of these helps in waste management?
Explanation: Sorting waste and recycling materials reduces landfill use and conserves resources.
Which is an example of sustainable practice?
Explanation: Solar panels use renewable energy and reduce dependency on fossil fuels, a sustainable approach.
Which is a direct effect of pollution on biodiversity?
Explanation: Pollution damages ecosystems and can lead to declines or extinctions of sensitive species.
Which simple action can students take to conserve resources at school?
Explanation: Planting trees improves air and shade; saving water reduces resource strain—both are practical student actions.