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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Q. Denitrification may be distinguished as

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Q. The conversion of molecular nitrogen into ammonia is known as

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Q. The breakdown of cattle manure in biogas is accomplished by which of the following type of bacteria?

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Q. Which of the following species of different genera of bacteria are not capable of transforming nitrate to nitrogen?

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Q. Some microorganisms have the ability to increase the nitrogen content of soils, are called as

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Q. Nitrogen fixation

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Q. For rapid decomposition by microbes, the substrate should have a C/N ratio of

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