Ecosystem Class 12 MCQs Questions with Answers

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

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

3. Maximum absorption of rainfall water is done by

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

5. Zone of atmosphere near the ground is

6. Bacterial role in carbon cycle is

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

8. Ultraviolet radiation from sunlight causes a reaction which produces

9. Ecology deals with:

10. Concentration of nitrogen remains constant by

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

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

13. Biosphere means:

14. The most abundant element present in the plants is

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. Xerophyte Contains:

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

20. Pyramid of numbers is: