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Nature's Treasures: questions with answers

Class 6 Science, Chapter 11 (NCERT). 15 questions by concept, 11 with pictures. Open “Show answer” for the answer and why.

How to teach this chapter · Common misconceptions & worked visual for this chapter

Air, Oxygen and Wind

Question 1

Which description of air is correct?

  1. (a)Air is not around the Earth.
  2. (b)Air is only nitrogen and oxygen.
  3. (c)Air is only oxygen.
  4. (d)Air surrounds the Earth and is a mixture of nitrogen, oxygen, argon, carbon dioxide and other gases in small quantities.
Show answer

(d) Air surrounds the Earth and is a mixture of nitrogen, oxygen, argon, carbon dioxide and other gases in small quantities.

Air surrounds the Earth. It is a mixture of gases: nitrogen, oxygen, argon, carbon dioxide and other gases in small quantities. So air is not only oxygen or only two gases.

Water Use, Conservation and Pollution

Question 2

The figure collects roof runoff for later use. What is needed before using the stored water for drinking?

Rainschoolchannellarge container
  1. (a)Checking its safety and treating it as needed
  2. (b)Checking the building type only
  3. (c)Nothing; water from every source is drinkable
  4. (d)Checking the container size only
Show answer

(a) Checking its safety and treating it as needed

Roof runoff can carry dirt and other contaminants. Collection and storage alone do not make water safe to drink.

Question 3

Plastic-free sewage and harmful factory waste are kept out of a river. How does this conserve water?

  1. (a)No conservation without collecting extra water
  2. (b)No protection needed without plastic litter
  3. (c)Already usable water regardless of waste
  4. (d)Protection of usable water from contamination
Show answer

(d) Protection of usable water from contamination

Preventing sewage and harmful factory waste from entering a river protects water quality. Conserving water includes protecting its fitness for use.

Energy from the Sun

Question 4

The drawing shows a device that uses heat and light from the Sun. What is this device used for?

  1. (a)cooking food
  2. (b)giving light only for seeing
  3. (c)producing electricity
  4. (d)heating water
Show answer

(d) heating water

Solar water heater is named as a way to use heat and light from the Sun. Its stated use is heating water.

Question 5

The figure shows an energy chain with one label marked ?. Which label best completes the chain?

Sun?cow
  1. (a)the Sun as food for the cow
  2. (b)grass
  3. (c)sunlight
  4. (d)light for the cow to see
Show answer

(b) grass

A cow gets energy from grass. Grass is a plant, and plants use sunlight to prepare food.

Question 6

A diagram shows the Sun on the left and a plant on the right. An arrow points from the Sun to the plant and is marked ?. What does the arrow mean?

SunPlant?
  1. (a)Sunlight helps plants prepare food.
  2. (b)Coal is the plant's source of energy.
  3. (c)The plant is only standing in light.
  4. (d)The Sun gives heat for drying the plant.
Show answer

(a) Sunlight helps plants prepare food.

The arrow points from the Sun to the plant, so it shows what the plant gets from the Sun. Sunlight helps plants prepare food, and plants get energy from the Sun.

Forests, Biodiversity and Soil Protection

Question 7

Use the two ground patches in the figure. The mark ? points to one soil-related part or effect. Which explanation best fits the marked part?

patch with treepatch with cut stumpsoil?
  1. (a)Fallen leaves prevent soil from being washed away by holding it like roots.
  2. (b)Fallen leaves can decay and enrich the soil with nutrients.
  3. (c)It shows that soil quality changes, but not because of roots, washed-away soil, fallen leaves, or nutrients.
  4. (d)It only shows that there are fewer trees, not any effect on soil.
Show answer

(b) Fallen leaves can decay and enrich the soil with nutrients.

The figure points to fallen leaves on the ground. The soil rule is that roots hold on to the soil and prevent it from being washed away, while fallen leaves decay and enrich soil with nutrients.

Question 8

Why does the diversity of life forms in a forest matter for living beings?

  1. (a)Because forests are useful only for products that people get from them.
  2. (b)Because animals can survive without depending on other life forms.
  3. (c)Because every animal depends on other life forms for survival, and diversity ensures food for every living being.
  4. (d)Because diversity means there are many trees but no other living beings.
Show answer

(c) Because every animal depends on other life forms for survival, and diversity ensures food for every living being.

In nature, every animal depends on other life forms for survival. The diversity of life forms ensures food for every living being.

Soil, Rocks and Minerals

Question 9

A simple flow shows the source box blank and the result box labelled aluminium. What should be written in the source box?

?aluminium
  1. (a)soil
  2. (b)rocks directly, not minerals
  3. (c)nothing useful comes from minerals
  4. (d)minerals
Show answer

(d) minerals

Important metals such as aluminium, gold, copper and iron are extracted from minerals. The source box should name the material that provides aluminium, so it should be minerals.

Question 10

The bowls show different soil shades from Place G and Place H. What can be inferred about their contents?

Place GPlace H
  1. (a)No minerals in the darker sample
  2. (b)Exact minerals identifiable from shade alone
  3. (c)Possibly different mixtures of materials
  4. (d)Identical composition in every soil
Show answer

(c) Possibly different mixtures of materials

Different soil colours may reflect different materials. Colour alone does not identify the exact contents of either sample.

Question 11

What should replace the ? on the long arrow in the sequence?

living organisms, Sun, water?RockBroken piecesSoil
  1. (a)living organisms, Sun, water
  2. (b)quickly, as soon as the rock breaks
  3. (c)over a long time, thousands of years
  4. (d)breaking apart of rocks, with no long time
Show answer

(c) over a long time, thousands of years

The sequence shows rocks breaking apart by the actions of the Sun, water and living organisms. The long arrow asks for the time description. Soil forms over a long time, thousands of years.

Fossil Fuels and Air Pollution

Question 12

How does burning more fossil fuel in homes and vehicles affect air pollution?

  1. (a)Less pollution as fuel stocks shrink
  2. (b)More visible smoke only
  3. (c)More smoke and invisible gases released
  4. (d)More road crowding only
Show answer

(c) More smoke and invisible gases released

Burning more fossil fuel releases more carbon dioxide and can also release smoke and other pollutants.

Natural, Human-Made, Renewable and Non-Renewable Resources

Question 13

Exactly one resource in the table is in the wrong column. What correction does the table need?

RenewableresourcesNon-renewableresourcesairmineralscoalrocks
  1. (a)air → Non-renewable resources
  2. (b)All entries under Non-renewable resources
  3. (c)All entries under Renewable resources
  4. (d)coal → Non-renewable resources
Show answer

(d) coal → Non-renewable resources

Coal is a fossil fuel, and fossil fuels are non-renewable resources.

Question 14

Which missing term and overall grouping fit the resource tree?

Natural ResourcesRenewable resourcesNon-renewable resourcesairwaterforestmineralsrocks?coalpetroleumnatural gas
  1. (a)water; renewable and non-renewable groups
  2. (b)fossil fuels; every natural resource in the renewable group
  3. (c)fossil fuels; renewable and non-renewable groups
  4. (d)renewable resources; every natural resource in the non-renewable group
Show answer

(c) fossil fuels; renewable and non-renewable groups

The missing term is fossil fuels. Natural resources include both renewable and non-renewable groups.

Question 15

The table has one marked entry that is in the wrong column. Which change should be made?

Natural resourcesHuman-made resourceswater, soil, solar panels (?)electric bulbs, bicycles
  1. (a)Keep solar panels in Natural resources.
  2. (b)Move electric bulbs to Natural resources instead.
  3. (c)Move water to Human-made resources instead.
  4. (d)Move solar panels to Human-made resources.
Show answer

(d) Move solar panels to Human-made resources.

Resources which we get from nature are called natural resources, while resources created by human beings to meet their needs are called human-made resources. The entry solar panels should be placed under Human-made resources. So the change to be made is: Move solar panels to Human-made resources.

Common misconception in Nature's Treasures

Open full misconception guide →

Can renewable resources run out locally?

Wrong

Groundwater can never run low because rain renews it.

Why it feels right. The water cycle keeps returning water.

Right

A supply can fall when use exceeds replenishment.

Worked example

Water in10 units
Water out15 units
Wells remove five more units than recharge adds in the same period.

If a local aquifer receives 10 units of water and wells draw 15 in the same period, its storage falls by 5 units.