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

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