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UPSC Civil Services Test Prep: Class 12 Biology
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UPSC Civil Services Test Prep: Class 12 Biology
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24 Questions

1. The second trophic level in a lake is
2. The reservoir for the gaseous type of bio-geochemical cycle exists in
3. During the process of ecological succession the changes that take place in communities are:
4. How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?
5. Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm
6. The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:
7. Which of the following is not a producer?
8. Approximately how much of the solar energy falls on the leaves of a plant is converted to chemical energy by photosynthesis?
9. Decomposers like fungi and bacteria are:
i. autotrophs
ii. heterotrophs
iii. saprotrophs
iv. chemo-autotrophs.
Choose the correct answer:
10. The reservoir for the gaseous type of bio-geochemical cycle exists in
11. Among the following, where do you think the process of decomposition would be the fastest?
12. During the process of ecological succession the changes that take place in communities are:
13. What is the percentage of photosynthetically active radiation (PAR) in the incident solar radiation?
14. If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
15. The sequence of communities of primary succession in water is:
16. Edaphic factor refers to:
17. Pyramid of numbers is:
18. Which of the following ecosystems is most productive in terms of net primary production?
19. Which of the following is an ecosystem service provided by a natural ecosystem?
20. If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be
21. Edaphic factor refers to:
22. Which of the following ecosystems is most productive in terms of net primary production?
23. The process of mineralization by microorganisms helps in the release of:
24. Secondary producers are

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