Ecosystem Class 12 MCQs Questions with Answers

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

2. Ultraviolet radiation from sunlight causes a reaction which produces

3. Bacterial role in carbon cycle is

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

5. Ecology deals with:

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

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

8. The most abundant element present in the plants is

9. Xerophyte Contains:

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

11. Biosphere means:

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

13. Maximum absorption of rainfall water is done by

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

15. Pyramid of numbers is:

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

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

18. Zone of atmosphere near the ground is

19. Concentration of nitrogen remains constant by

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