Ecosystem Class 12 MCQs Questions with Answers

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

2. Zone of atmosphere near the ground is

3. Pyramid of numbers is:

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

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

6. Biosphere means:

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

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

9. Ecology deals with:

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

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

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

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

14. Concentration of nitrogen remains constant by

15. Maximum absorption of rainfall water is done by

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

17. Ultraviolet radiation from sunlight causes a reaction which produces

18. Xerophyte Contains:

19. Bacterial role in carbon cycle is

20. The most abundant element present in the plants is