Ecosystem Class 12 MCQs Questions with Answers

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

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

3. Maximum absorption of rainfall water is done by

4. Zone of atmosphere near the ground is

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

6. Pyramid of numbers is:

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

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

9. Biosphere means:

10. Ultraviolet radiation from sunlight causes a reaction which produces

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

12. Xerophyte Contains:

13. Concentration of nitrogen remains constant by

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

15. Ecology deals with:

16. Bacterial role in carbon cycle is

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

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

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

20. The most abundant element present in the plants is