11. The capacity of the organic and biological matter in a sample of natural water to consume oxygen and the process catalysed by bacteria is
12. How much water, out of the total water evaporated from the oceans, is available to terrestrial ecosystem?
13. Good soil is one which has
14. Which of the following is a molecular disease?
15. Ultra-violet light causes
16. The term which shows relationship existing between parts of measures is
17. Halocarbons or halons are constituents of
18. Which of the following functions performed by a forest help most in controlling drought?
19. Most primary productivity in the surface water of lakes and oceans is due to
20. The tropical cyclone is known as
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