Q. Which of the following conditions decreases the level of denitrification?

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Q. Which of the following are not the features of component II of nitrogenase enzyme complex?

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Q. Which of the following is a symbiotic nitrogen fixing bacteria?

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Q. Which among the following are the most important agents for carbon dioxide fixation?

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Q. Fresh air contains approximately ______ percent carbon dioxide by volume.

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Q. Cellulose is degraded to cellobiose by the enzyme __________________

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Q. The amount of organic material in the forest soil remains approximately the same from year to year.

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Q. In carbon cycle flow of energy is _________________

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Q. Cellobiose is metabolized directly by many microorganisms.

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Q. Cysteine breaks down in presence of cysteine desulfurase to give _________________

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Q. Which of the following processes is performed by Thiobacillus thiooxidans?

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Q. Sulphates are reduced to hydrogen sulphide by _____________________

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Q. The Winogradsky column experiment is done in the dark.

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Q. The reduction of sulphates and sulphites to hydrogen sulphide is done by which group of bacteria?

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Q. Which among the following develop in the upper portion of the Winogradsky column?

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Q. Purple and green sulfur bacteria use ___________________ as the electron donor to reduce carbon dioxide.

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Q. Which among the following is a non-sulfur purple bacteria?

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Q. The moisture contained in clouds and precipitated as snow,hail,rain etc constitutes _________________

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Q. The surface waters are susceptible to contamination with microorganisms from _______________

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Q. Which of the following is subterranean water?

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