The most polluted city in the world is

A. Tokyo

B. New York

C. Calcutta

D. Mexico

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  2. The term "ecosystem" was first proposed by
  3. Trophic levels are formed by
  4. The energy storage of consumer level is called
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  6. The whale is
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  19. An association between two or more species in which both are benefited is known as
  20. An organism which lives at the expense of another organism is called
  21. Bio tic factors are
  22. The soils transported by water are called
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  24. In a food-chain, the saprophytic organisms are
  25. Pedology is the study of
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  27. Biome is
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