Ecosystem Class 12 MCQs Questions with Answers

1. Maximum absorption of rainfall water is done by

2. Xerophyte Contains:

3. Zone of atmosphere near the ground is

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

5. The most abundant element present in the plants is

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

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

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

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

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

11. Ultraviolet radiation from sunlight causes a reaction which produces

12. Bacterial role in carbon cycle is

13. Biosphere means:

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

15. Pyramid of numbers is:

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

17. Ecology deals with:

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

19. Concentration of nitrogen remains constant by

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