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MCQ Science and Technology Chapter 7 Class 9 Maharashtra Board

Energy Flow in an Ecosystem

1. Which process releases carbon dioxide back into the atmosphere after the death of organisms?

Question 1 of 20

2. What is the chemical equation for photosynthesis in the carbon cycle?

Question 2 of 20

3. Which abiotic process releases carbon dioxide into the atmosphere?

Question 3 of 20

4. What maintains the equilibrium of oxygen and carbon dioxide in the atmosphere?

Question 4 of 20

5. What percentage of the atmosphere is formed by oxygen?

Question 5 of 20

6. Which process releases oxygen into the atmosphere?

Question 6 of 20

7. Which of the following uses oxygen in the oxygen cycle?

Question 7 of 20

8. What makes the oxygen cycle complex?

Question 8 of 20

9. Which form of oxygen is produced through atmospheric processes?

Question 9 of 20

10. What percentage of the atmosphere is nitrogen?

Question 10 of 20

11. What is nitrogen an important component of in organisms?

Question 11 of 20

12. Which process converts nitrogen into nitrates and nitrites?

Question 12 of 20

13. What is the release of ammonia through decomposition called?

Question 13 of 20

14. Which process converts ammonia into a nitrite and then nitrate?

Question 14 of 20

15. What converts nitrogen compounds into gaseous nitrogen?

Question 15 of 20

16. Which organisms are classified as primary consumers?

Question 16 of 20

17. Which of the following is an apex consumer?

Question 17 of 20

18. What is the role of decomposers in the energy pyramid?

Question 18 of 20

19. Who studied the food chain and energy flow in 1942?

Question 19 of 20

20. What happens to the number of organisms from the lowest to the highest trophic level?

Question 20 of 20


 

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