Q. The primary producers transform radiant energy into heat energy.

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Q. The biological activity of an aquatic ecosystem is dependent upon which of the following factors?

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Q. Which of the following water bodies, the role of photosynthetic organisms is considerably reduced?

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Q. Which of the following aquatic organisms contribute in a small amount to the shallow estuary food web?

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Q. Which among the following are referred to as the “pasture of the sea”?

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Q. The term fertility of oceans is used to express the capacity for production of inorganic matter.

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Q. What amount of dry organic matter is produced by the deep ocean areas?

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Q. Which among the following factors are limiting growth of phytoplankton organisms?

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Q. Which among the following oceans is the most richest in life?

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Q. In which of the following water bodies, fertility is high?

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Q. Which of the following product is not obtained from dissimilation of organic matter under aerobic conditions?

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Q. Which of the following organism have siliceous skeletons?

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Q. The nonsymbiotic bacteria which fix nitrogen live in the soil independently are

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Q. Nitrogen fixation by the microorganisms can be detected by adopting the approach of

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Q. Which of the following is not the biofertilisers producing bacteria?

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Q. Which of the following is capable of oxidizing sulfur to sulfates?

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Q. Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

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Q. Which of the following microorganism use H2S as the electron donor to reduce carbon dioxide?

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Q. Nitrifying bacteria can not be isolated directly by the usual techniques employed to isolate hetrotrophic bacteria. The reasons may be due to

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Q. Bacteria, as a group, are responsible for

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