CLASS 6 · SCIENCE · CHAPTER 11

Nature’s Treasures

Simple answers to all 16 end questions, with practical examples for the chapter’s activities on natural resources and conservation.

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Textbook pages 227–229

Question 1

Unscramble the names (ockr, refost, ndiw, atwre) and classify them as renewable or non-renewable.

Steps only

Rock—non-renewable; forest—renewable; wind—renewable; water—renewable.

Answer

Rock—non-renewable; forest, wind, and water—renewable.

Question 2

Mark each statement True or False and correct the false ones: (i) Nature has all the resources to meet human needs. (ii) Machines are a resource found in nature. (iii) Natural gas is non-renewable. (iv) Air is renewable.

Steps only

(i) False—resources are limited. (ii) False—machines are human-made. (iii) True. (iv) True.

Answer

F, F, T, T.

Question 3

Choose the correct options: (i) Common fuel in scooters or bikes: kerosene, petrol, diesel, or LPG? (ii) Which is renewable: coal, water, natural gas, or petrol?

Steps only

(i) Petrol (ii) Water

Answer

Petrol; water.

Question 4

Classify coal, natural gas, forests, and minerals as renewable or non-renewable resources.

Steps only

Renewable: forests. Non-renewable: coal, natural gas, minerals.

Answer

Forests—renewable; coal, natural gas, and minerals—non-renewable.

Question 5

Why is petroleum called a non-renewable resource?

Steps only

Petroleum takes millions of years to form and cannot be quickly replaced.

Answer

Petroleum is non-renewable because it forms very slowly and is limited.

Question 6

It is difficult to regrow forests. Justify this statement.

Steps only

Trees and forest habitats take many years to recover after clearing.

Answer

Forests take a long time to regrow because trees and habitats recover slowly.

Question 7

List five daily activities that use natural resources and suggest ways to reduce their use.

Steps only

Save water, walk or use public transport, switch off lights, avoid food waste, and use less paper.

Answer

Use water, fuel, electricity, food, and paper carefully; reuse and avoid waste.

Question 8

List four activities that are possible due to the presence of air.

Steps only

Breathing, burning, flying a kite, and turning a windmill.

Answer

Breathing; burning; flying a kite; using wind to turn a windmill.

Question 9

How can you help increase the green cover in your locality? List actions.

Steps only

Plant native trees, care for saplings, protect existing trees, and join community planting.

Answer

Plant and care for local trees and protect existing green spaces.

Question 10

For the cooking method shown, (i) what type of energy is used? (ii) Give one benefit and one drawback.

Steps only

Solar energy; benefit—renewable and smokeless; drawback—depends on sunshine.

Answer

Solar energy; clean and renewable, but depends on sunlight.

Question 11

Why does cutting trees on a large scale affect soil quality?

Steps only

Without trees, soil erodes more easily and receives fewer nutrients from decaying leaves.

Answer

Tree cutting increases soil erosion and reduces nutrient recycling.

Question 12

Explain two ways humans pollute air and suggest one action to reduce air pollution.

Steps only

Vehicle exhaust and burning fuels pollute air; use public transport or walk when possible.

Answer

Vehicle exhaust and fuel burning pollute air. Choose cleaner travel where possible.

Question 13

A family uses solar panels for electricity, a gas stove for cooking, and a windmill to pump water. What could happen if there were no sunlight for a week?

Steps only

Solar electricity would fall; gas cooking could continue; the windmill could work if wind is available.

Answer

Solar panels need sunlight; the stove needs gas; the windmill needs wind.

Question 14

Fill the natural-resource diagram using: fossil fuels, forest, air, petroleum, coal, water, and non-renewable resource.

Steps only

Renewable: air, water, forest. Non-renewable: fossil fuels—coal and petroleum.

Answer

Renewable: air, water, forest. Fossil fuels (coal, petroleum): non-renewable.

Question 15

Trees are cut to meet industry and housing needs. Is this justified? Prepare a brief report.

Steps only

Meet needs carefully: avoid unnecessary cutting, reuse materials, protect forests, and restore damaged areas.

Answer

Large-scale cutting is harmful; use resources responsibly and protect or restore forests.

Question 16

Suggest a plan to use less water in your school, the steps to carry it out, and how it helps the environment.

Steps only

Find leaks, repair them, turn taps off, reuse suitable water for plants, and monitor use.

Answer

A school water-saving plan conserves freshwater and energy.

Chapter activities and learning prompts

Textbook pages 208–226, 229–230

Question Activities 11.1–11.2

What does the breathing activity show? What makes a paper firki rotate?

Steps only

We need air to breathe; wind pushes and turns a firki.

Answer

Oxygen in air is needed by our body; moving air turns a firki.

Question Section 11.2

Name common uses and sources of water.

Steps only

Uses: drinking, cooking, washing, farming. Sources: rain, rivers, lakes, and groundwater.

Answer

We use water at home, on farms, and in industry; it comes from surface water and groundwater.

Question Activity 11.3

Give simple ways to reduce water waste while washing, cooking, gardening, and brushing teeth.

Steps only

Turn taps off, repair leaks, use only what is needed, and reuse suitable water for plants.

Answer

Avoid running taps and repair leaks.

Question Section 11.2

What is rainwater harvesting and how does it conserve water?

Steps only

Collect and store rainwater or help it soak into the ground to save water and recharge groundwater.

Answer

Rainwater harvesting collects rain for later use or groundwater recharge.

Question Section 11.3

Give examples of how people use heat and light from the Sun. Why does a cow get energy indirectly from the Sun?

Steps only

Sunlight dries and heats things and makes solar electricity. A cow gets the Sun's energy through the grass it eats.

Answer

The Sun powers solar devices and helps plants make food for animals.

Question Section 11.4

List products from forests and explain why forests should be protected.

Steps only

Forests provide fruits, honey, medicines, and habitat; use them carefully and protect wildlife.

Answer

Forests provide useful products and homes for many living things.

Question Activity 11.4

What may be found in soil, and why can samples look different?

Steps only

Soil contains mineral pieces and living or decaying matter; its mixture changes by location.

Answer

Soils differ in colour and texture because their contents differ.

Question Activities 11.5–11.6

Give examples of fuels used by vehicles and natural resources used for making clay toys, firewood, kites, and breakfast.

Steps only

Clay toys—clay and water; firewood—trees; kites—paper and bamboo; breakfast—plant and animal foods.

Answer

Daily products use natural resources directly or indirectly.

Question Learning further

Name common sources of air pollution and two practical ways a school or community can reduce it.

Steps only

Sources: traffic and burning. Actions: use cleaner travel and do not burn rubbish.

Answer

Identify local sources and reduce vehicle emissions and open burning.

Question Learning further

Name some rocks or minerals used in a town or village and what they are used for.

Steps only

Granite/building; slate/roofing; iron/tools; copper/wires.

Answer

Rocks and minerals are used in construction, tools, and electrical products.

Question Learning further

List steps for organising a school tree-planting activity and caring for the planted trees.

Steps only

Get permission, choose native trees, plant safely, and assign regular care.

Answer

A planting drive must include long-term care for the saplings.