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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Q. Which are the main source of biofertilisers?

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Q. The organisms responsible for the characteristic musty or earth odor of a freshly plowed field is/are

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Q. Denitrification is

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Q. Degree of compost maturity can be assesed by

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Q. The energy value of biogas is typically

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Q. The microbial ecosystem of soil includes

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Q. Denitrification is carried out

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Q. Which of the following soil microorganism is involved in the reduction of sulfates to H2S?

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