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Nature's Treasures – Class 6 Science notes, important questions and MCQs

NCERT Class 6 Science, chapter 11. Notes, key terms, important questions with answers and MCQs.

Chapter overview

Nature gives us air, water, soil, sunlight, forests, minerals and fuels. Some resources renew themselves; others can run out, so we must use them wisely.

Types of resources

Renewable / inexhaustible: sunlight, wind, water (when not polluted or over-used).
Non-renewable / exhaustible: coal, petroleum, natural gas, minerals — formed over millions of years.
Fossil fuels release carbon dioxide and pollutants when burnt.

Conservation

Use solar and wind energy; switch off lights and fans when not needed.
Save water: fix leaks, harvest rainwater, reuse water for plants.
Protect forests and soil: plant trees, avoid plastic, follow reduce–reuse–recycle.

Key terms

Natural resource: useful material or energy obtained from nature
Renewable resource: resource that can be replaced naturally
Fossil fuel: fuel formed from remains of ancient plants and animals (coal, petroleum)

Formulas

Reduce → Reuse → Recycle

Important questions with answers

Give two examples each of renewable and non-renewable resources.2 marks

Renewable: sunlight, wind (also water, forests if managed). Non-renewable: coal, petroleum (also natural gas, minerals).

Why should we use fossil fuels carefully?3 marks

They take millions of years to form and will run out if overused. Burning them also releases smoke and gases that pollute the air and warm the Earth.

Explain how air, water and soil are treasures for living things, and suggest five ways a student can conserve natural resources.5 marks

Air gives oxygen for breathing and carbon dioxide for plants; water is needed for drinking, farming and all life processes; soil supports plants and is home to many organisms, and grows our food. Ways to conserve: switch off lights and fans when not needed; walk, cycle or use public transport; close taps and reuse water; use both sides of paper and recycle; plant trees and avoid single-use plastic.

Quick revision

Sunlight and wind are renewable.
Coal and petroleum are exhaustible.
Conserve resources for the future.

Exam tips

Coal and petroleum are called fossil fuels because they come from fossils.
CNG and LPG are cleaner fuels than petrol and diesel.

Practice MCQs

Which is a renewable resource?
1. coal
2. petroleum
3. sunlight
4. natural gas
Show answer
Answer: (c) sunlight. It will not run out.
Coal and petroleum are
1. fossil fuels
2. renewable
3. metals
4. plastics
Show answer
Answer: (a) fossil fuels. Fossil fuels.
Which is a cleaner fuel for vehicles?
1. CNG
2. diesel
3. coal
4. kerosene
Show answer
Answer: (a) CNG. Fewer pollutants.
Rainwater harvesting helps to
1. waste water
2. recharge groundwater
3. increase floods
4. pollute rivers
Show answer
Answer: (b) recharge groundwater. Stores rainwater.
Which is a renewable resource
1. coal
2. petroleum
3. sunlight
4. natural gas
Show answer
Answer: (c) sunlight. Never runs out.
Why must fossil fuels be used carefully?
1. they take millions of years to form and pollute when burnt
2. they form quickly
3. they are renewable
4. they are found everywhere
Show answer
Answer: (a) they take millions of years to form and pollute when burnt. Limited and polluting.
Which action conserves energy at home?
1. keeping lights on all day
2. running taps
3. using LED bulbs and switching off unused appliances
4. using more plastic
Show answer
Answer: (c) using LED bulbs and switching off unused appliances. Saves electricity.
Coal and petroleum are called fossil fuels because they
1. formed from remains of ancient living things over millions of years
2. are found in fossils' bones
3. are made in factories
4. burn without smoke
Show answer
Answer: (a) formed from remains of ancient living things over millions of years. Formed from dead organisms.

All chapters of Class 6 Science

Written by Kundali IQ from standard, well-established facts to help with revision. This is not an official NCERT publication; always read your textbook too.