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Class 10

Explore popular questions from Our Environment for Class 10. This collection covers Our Environment previous year Class 10 questions hand picked by experienced teachers.

Our Environment

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Q 1. By which process producers like plants and blue green algae produce their food

Photosynthesis

B

Digestion

C

Both (A) & (B)

D

None of these

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Q 2. The microorganisms that break down the complex organic substance into simple inorganic substance that go into the soil and are used up once more by plants are

A

Consumers

B

Producers

Decomposers

D

None of these

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Q 3. Which of the following constitute a food-chain?

A

Grass, wheat and mango

Grass, deer and Lion

C

Goat, cow and elephant

D

Grass, fish and goat

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Q 4. The decrease of ozone in the atmosphere has been linked to synthetic chemical which is used as refrigerants and in fire extinguishers. This chemical is

Chlorofluorocarbons

B

Carbon monoxide

C

Carbon dioxide

D

None of these

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Q 5. Which of the following are environment friendly practices?

A

Carrying cloth bags to put purchases in while shopping

B

Switching off unnecessary lights and fans

C

Walking to school instead of getting your mother to drop you on her scooter

All of the above

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Q 6. In food chain

Percent of energies transfer will be respectively

1, 10, 10

B

90, 10, 10

C

1, 1, 1

D

1, 10, 0

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Q 7. The best source of energy is

A

Water

B

Soil

Plants

D

Ponds

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Q 8. Ozone depletion can lead to

A

Skin cancer

B

Eye cataract

Both A and B

D

Brain cancer

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Q 9. Each step or level of the food chain forms

trophic level

B

top level

C

bottom level

D

none of these

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Q 10. Plants and Animals are

Biotic components

B

Abiotic components

C

Both (A) and (B)

D

None of these

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Q 11. Each step or level of the food chain forms a trophic level. The autotrophs comes at which trophic level

First

B

Second

C

Third

D

Fourth

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Q 12. Which of the following comes under consumers?

A

Herbivores

B

Carnivores

C

Parasite

All of these

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Q 13. Each organism is generally eaten by several other organism. So instead of a straight line food chain, the relationship can be shown as a series of branching lines called

A

World web

B

Consumers web

Food web

D

Decomposers web

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Q 14. In 1987, which programme succeeded in forging an agreement to freeze CFC production at 1986 level.

UNEP

B

UNGP

C

AEP

D

None of these

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Q 15. {tex}\mathrm{Assertion}{/tex}: Each ecosystem contain only biotic components.
{tex}\mathrm{Reason}{/tex}: The autotrophs synthesize food material while heterotrophs utilise and resynthesize it.

A

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

Assertion is false but Reason is true

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Q 16. Sulphur dioxide affects

A

haemoglobin of blood

B

Arteries

Alveoli of lungs

D

Nerves

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Q 17. Which of the following is not a functional component of an ecosystem?

A

Communities

B

Decomposers

C

Sunlight

Energy flow

Explanation

The flow of energy is not a functional component of an ecosystem.

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Q 18. Free services provided to humans by ecosystems include

A

control of atmospheric carbon dioxide concentration

B

prevention of soil erosion

C

filtering of pollutants from water and air

all of the above

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Q 19. Why do scientists think that human-induced global warming will be more harmful to plants and animals than were past, natural climate fluctuations?

because temperatures will change faster

B

because the temperature changes will be larger

C

because species now are less adaptable than species in the past

D

because ecosystems are now more complicated than they used to be

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Q 20. As energy is passed from one trophic level to another, the amount of usable energy

A

increases

decreases

C

remains the same

D

energy is not passed from one trophic level to another

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Q 21. Each step in a food chain is called a

trophic level

B

consumer level

C

food web

D

producer

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Q 22. CO2 absorbs some of the __________ that radiates from the surface of earth to space

A

ozone

heat

C

food web

D

producer

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Q 23. The biological process by which carbon is returned to its reservoir is

A

photosynthesis

B

de-nitrification

C

carbon fixation

cellular respiration

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Q 24. For corrosion of metals, there should be

A

Exposed surface of metal

B

Moisture

C

Air

All of the above

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Q 25. The last chain of food is

A

producers

decomposers

C

parasites

D

none of the above