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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
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  6. The whale is
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  18. Synecology is the study of
  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
  23. Which of the following is normally not an important atmospheric pollutant
  24. In a food-chain, the saprophytic organisms are
  25. Pedology is the study of
  26. Gas liberated in Bhopal gas tragedy was
  27. Biome is
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