Revise Class 10 Science – Our Environment with Our MCQ Mock Test!

How well do you understand the interactions within our ecosystem and the impact of human activities on the environment? Test your knowledge with this MCQ-based mock test on Our Environment. Designed as per the latest CBSE Class 10 Science syllabus, it covers all the important topics including ecosystems and their components, food chains and food webs, energy flow in an ecosystem, the importance of decomposers, ozone layer depletion, and problems caused by waste generation.

This test is the perfect way to revise core concepts, practice exam-oriented questions, and boost your preparation. With thoughtfully designed multiple-choice questions, you can test your knowledge, improve speed and accuracy, and be fully ready for school exams and board exams.

Attempt now and make Our Environment one of your strongest chapters!

1. In an ecosystem, herbivores represent

producers

primary consumers

secondary consumers

decomposers

2. Nowadays, which type of cups are being generally used in trains for serving tea, coffee, soup, etc. on daily basis?

Disposable cups made of clay

Washable plastic cups

Washable glass cups

Disposable paper cups

3. Which of the following is non-biodegradable? Which of the following is non-biodegradable?

wool

nylon

animal bones

tea leaves

4. Which one of the following will undergo fastest bio-degradation?

Mango Seed

Wood

Mango Peel

Mango Pulp

5. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Accumulation of harmful chemicals is maximum in case of organisms at higher trophic level.
Reason: Food chain normally do not go beyond 3 or 4 trophic level.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the Reason is false.

Assertion is false but the Reason is true.

6. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Autotrophs can produce food on its own.
Reason: Green plants can absorb 1% energy of sunlight that fall on the leaves.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the Reason is false.

Assertion is false but the Reason is true.

7. Excessive exposure of humans to UV-rays results in
(i) damage to immune system
(ii) damage to lungs
(iii) skin cancer
(iv) peptic ulcer

(i) and (ii)

(ii) and (iv)

(i) and (iii)

(iii) and (iv)

8. If a grasshopper is eaten by a frog, then the energy transfer will be from

producer to decomposer

producer to primary consumer

primary consumer to secondary consumer

secondary consumer to primary consumer

9. An ecosystem is represented in the figure given above. This ecosystem will be selfsustaining if

the type of organisms represented by B are eliminated.

materials cycle between the organisms labelled A and the organisms labelled B.

the organisms labelled A outnumber the organisms labelled B.

the organisms labelled A are equal in number to the organisms labelled B.

10. Which of the following is nonbiodegradable?

Wool

Nylon

Animal bones

Tea leaves

11. Which of the following is an autotroph?

Lion

Insect

Tree

Mushroom

12. An ecosystem includes

all living organisms

non-living objects

both living organisms and non-living objects

sometimes living organisms and sometimes nonliving objects

13. Which of the following is a logical sequence of food chain

producer → consumer → decomposer

producer → decomposer → consumer

consumer → producer → decomposer

decomposer → producer → consumer

14. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Vegetarian food habit is more beneficial to organisms.
Reason: Only 10% energy is available as food from one trophic level to next.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the Reason is false.

Assertion is false but the Reason is true.

15. Which rays strike on earth due to depletion of ozone layer?

Visible light

Microwaves

Infrared

Ultraviolet

16. Which group of organisms are not constituents of a food chain?

Grass, lion, rabbit

Plankton, man, fish, grasshopper

Wolf, grass, snake, tiger

Frog, snake, eagle, grass, grasshopper

17. Which of the following statements about food chain and energy flow through ecosystem is false?

Food webs include two or more food chains.

All organisms that are not producers are consumers.

A single organism can feed at several trophic levels.

Detritivores feed at all trophic levels except the producer level.

18. Trophic level in an ecosystem represents

oxygen level

water level

energy level

salt level

19. First link in any food chain is usually green plants because

they are widely distributed

they are fixed at one place in the soil

they alone have the capacity to synthesise food using sunlight

there are more herbivores than carnivores

20. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Biodegradable waste and non biodegradable waste should be discarded separately,
Reason: Biodegradable waste are not harmful.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the Reason is false.

Assertion is false but the Reason is true.

21. In the following questions, the Assertion and Reason have been put forward. Read the statements carefully and choose the correct alternative from the following:

Assertion: Ozone layer is getting depleted at upper atmosphere which is a cause of concern.
Reason: CFC reacts with ozone and breaks it.

Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.

The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.

Assertion is true but the Reason is false.

Assertion is false but the Reason is true.

22. Which of the following is biodegradable?

Plastic Mugs

Leather Belts

Silver Foils

Iron Nails

23. Which statement shows interaction of an abiotic component with a biotic component in an ecosystem?

A grasshopper feeding on a leaf.

Rainwater running down into a lake.

An earthworm making a burrow in the soil.

A mouse fighting with another mouse for food.

24. In the garden ecosystem, which of the following are producers?

Insects

Snakes

Grasses

Rabbits

25. Soil fertility is determined by its ability to:

Decay organic matter

Hold organic matter

Hold water

Support life

26. The manufacturing of chlorofluorocarbons free refrigerators is mandatory throughout the world. How does this help prevent ozone depletion?

This will help convert oxygen molecules into ozone.

This will help convert the CFCs into ozone molecules.

This will reduce the production CFCs from oxygen molecules.

This will reduce the release of CFCs that reacts with ozone molecules.

27. In an ecosystem 10% of energy available for transfer from one trophic level to the next is in the form of:

heat energy

chemical energy

mechanical energy

light energy

28. The table lists some waste products

Which group of waste materials can be classified as non-biodegradable?

Plant waste, tea bags

Polythene bags, plastic toys

Used tea bags, paper straw

Old clothes, broken footwear

29. A food chain comprises of birds, green plants, fish and man.

The concentration of harmful chemical entering the food chain will be maximum in

green plants

man

birds

fish

30. Which one of the following is an artificial ecosystem?

Pond

Crop Field

Lake

Forest

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