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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Which of the following is subterranean water?

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

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

View solution

Q. Phytoplanktonic organisms are non-motile.

View solution

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

View solution

Q. Large spiraling surface currents in the ocean that tend to aggregate and retain nutrients are known as _______________

View solution

Q. Most aquatic microorganisms can grow on the usual laboratory media.

View solution