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. Which of the following is biodegradable?

 
 
 
 

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

 
 
 
 

3. 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.

 
 
 
 

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

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

 
 
 
 

5. An ecosystem includes

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. The table lists some waste products

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

 
 
 
 

11. 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.

 
 
 
 

12. Which of the following is nonbiodegradable?

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

16. In an ecosystem, herbivores represent

 
 
 
 

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

 
 
 
 

18. 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.

 
 
 
 

19. 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.

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

23. Which of the following is an autotroph?

 
 
 
 

24. 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.

 
 
 
 

25. Trophic level in an ecosystem represents

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

29. Soil fertility is determined by its ability to:

 
 
 
 

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

 
 
 
 

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