Which among the following are referred to as the “pasture of the sea”?

The term fertility of oceans is used to express the capacity for the production of inorganic matter.

What amount of dry organic matter is produced by deep ocean areas?

In which of the following water bodies, fertility is high?

Which of the following product is not obtained from dissimilation of organic matter under aerobic conditions?

Which of the following organism have siliceous skeletons?

Which of the following forms of water is the most contaminated?

The coliform group of bacteria includes all the __________________ bacilli.

Which of the following organism does not belong to coliform group of bacteria?

Coliforms are natural inhabitants of the large intestine of human and animals.

Which of the following acts as a carbon source for Enterobacter aerogenes?

What will be the plate count of good quality water?

Among the following which microorganism acts as a representative of fecal streptococci group?

Thiobacillus can produce an acidity in the range of pH __________

In which of the following organism does iron secreted to form stalks or ribbons attached to the cell?

Which of the following sewerage systems carry domestic and industrial wastewater?

The more oxidizable organic material, the lesser the BOD.

Which of the following is a strict anaerobe?

In which of the following treatment involve oxidation of organic constituents of the wastewater?

The upper region of the trickling filter is favorable for the growth of _____________

Activated sludge usually employs an aeration period of ________________