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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Q. The phenomenon of commensalism refers to a relationship between organisms in which

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Q. The population of algae in soil is __________ that of either bacteria or fungi.

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Q. The transformation of nitrates to gaseous nitrogen is accomplished by microorganisms in a series of biochemical reactions. The process is known as

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Q. Nitrogen fixation refers to the direct conversion of atmospheric nitrogen gas into

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Q. The diagnostic enzyme for denitrification is

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Q. A heterocyst is

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Q. The groups of symbiotic bacteria, which have the ability to fix nitrogen

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Q. Nitrogen oxidation (nitrification)refers to the

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Q. An example of a symbiotic nitrogen fixer is

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Q. In the process of nitrogen fixation, which of the following microorganism is involved?

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Q. Which of the following statement is not true about composition of biogas?

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Q. The physical structure of soil is improved by the accumulation of

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Q. __________ play a key role in the transformation of rock to soil.

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Q. The groups of bacteria which have the ability to fix nitrogen from air to soil are

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Q. The nitrogenase consists of

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Q. The crops which are involved in nitrogen fixation are

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