Ecosystem Class 12 MCQs Questions with Answers

1. Biosphere means:

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

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

4. Zone of atmosphere near the ground is

5. The most abundant element present in the plants is

6. Maximum absorption of rainfall water is done by

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

8. Bacterial role in carbon cycle is

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

10. Pyramid of numbers is:

11. Concentration of nitrogen remains constant by

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

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

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

15. Ultraviolet radiation from sunlight causes a reaction which produces

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

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

18. Xerophyte Contains:

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

20. Ecology deals with: