MCQ Class 9 Science Exploration Chapter 13 Earth as a System: Energy, Matter, and Life

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1. Photosynthesis uses:

Question 1 of 20

2. Burning fossil fuels releases:

Question 2 of 20

3. Nitrogen is needed for:

Question 3 of 20

4. Nitrogen fixation converts:

Question 4 of 20

5. Nitrification produces:

Question 5 of 20

6. Denitrification returns nitrogen to:

Question 6 of 20

7. Oxygen cycle maintains balance between:

Question 7 of 20

8. Photosynthesis releases:

Question 8 of 20

9. Combustion uses:

Question 9 of 20

10. Excess CO₂ leads to:

Question 10 of 20

11. Ocean acidification affects:

Question 11 of 20

12. Eutrophication is caused by:

Question 12 of 20

13. Deforestation reduces:

Question 13 of 20

14. Smog forms due to:

Question 14 of 20

15. Montreal Protocol deals with:

Question 15 of 20

16. Renewable energy includes:

Question 16 of 20

17. Biogeochemical cycles help to:

Question 17 of 20

18. Troposphere height is about:

Question 18 of 20

19. Greenhouse gases include:

Question 19 of 20

20. Earth system consists of:

Question 20 of 20


 

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