Ecosystem Class 12 MCQs Questions with Answers

1. Bacterial role in carbon cycle is

2. Which of the following is the most stable ecosystem?

3. Ecology deals with:

4. During food chain the maximum energy is stored in :

5. Xerophyte Contains:

6. The most abundant element present in the plants is

7. Which of the following ecosystem has highest gross primary productivity:

8. The process of mineralisation by micro organisms helps in the release of:

9. Maximum absorption of rainfall water is done by

10. Concentration of nitrogen remains constant by

11. Pyramid of numbers is:

12. Biosphere means:

13. Which of the following is called as a detrivore?

14. Which of the following is expected to have the highest value (gm/m²/yr) in a grassland ecosystem?

15. Approximately how much of the solar energy that falls on the leaves of a plant is converted to chemical energy by photosynthesis?

16. The rate of conversion of light energy into chemical energy of organic molecules in an ecosystem is

17. An inverted pyramid of biomass can be found in which ecosystem?

18. Breakdown of detritus by microbial enzymes into simple forms is called?

19. Ultraviolet radiation from sunlight causes a reaction which produces

20. Zone of atmosphere near the ground is