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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Q. Wells less than ___________ deep are considered to be shallow.

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Q. Thermus aquaticus, a common bacterial inhabitant generally prevails in temperatures of ____________

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Q. Hydrostatic pressure increases the boiling point of water but does not change the solubility of nutrients.

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Q. Primary producers are found growing in which of the following layers of water?

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Q. The degree of salinity in freshwater is nearly zero.

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Q. The microorganisms from lakes and rivers can grow at a salt concentration of _________

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Q. Which of the following compounds are required for growth of saprophytic bacteria and fungi?

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Q. Protozoa and other minute animal life are known as ____________________

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Q. Microbial inhabitants of the bottom region of a body of water are referred to as ________________

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Q. Phytoplanktonic organisms are non-motile.

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Q. Which of the following places shows presence of Geothermal vents?

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