Questions and answers for exam Preparation

MCQs

Total Questions : 43 | Page 4 of 5 pages

Question 31. Loss of carbon through the microbial loop in oligotrophic environments is __________ to/than the loss of carbon through the microbial loop in copiotrophic environments.

greater
lesser
approximately equal
half

Discuss Question

Answer: Option A. -> greater

Question 32. . Which of the following is correct?

A Winogradsky column is used to filter out microorganisms from a water sample taken from a deep black smoker
A Winogradsky column is used to demonstrate interactions and gradients that occur in aquatic environments
Both (a) and (b)
A Winogradsky column is used to filter out microorganisms from non-aquatic environments

Discuss Question

Answer: Option B. -> A Winogradsky column is used to demonstrate interactions and gradients that occur in aquatic environments

Question 33. . Activated sludge undergoes

Primary treatment
Secondary treatment
Tertiary treatment
any of these

Discuss Question

Answer: Option B. -> Secondary treatment

Question 34. . The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.

greater
lesser
approximately equal
half

Discuss Question

Answer: Option A. -> greater

Question 35. . Which of the following species in water reveal the presence of fecal pollution of human or animal origin?

E.coli
Fecal Streptococci
Clostridium perfringens
All of these

Discuss Question

Answer: Option D. -> All of these

Question 36. .
__________ is an environment like __________ where microorganisms are functioning in an extremely thin film of water and where oxygen-containing air is close to them.

low oxygen diffusion environment; soils
high oxygen diffusion environment; soils
low oxygen diffusion environment; lakes
high oxygen diffusion environment; lakes

Discuss Question

Answer: Option B. -> high oxygen diffusion environment; soils

Question 37. . Trickling filter comes under

primary treatment
secondary treatment
tertiary treatment
none of these

Discuss Question

Answer: Option B. -> secondary treatment

Question 38. . Which of the following is correct?

A Winogradsky column is used to filter out microorganisms from a water sample taken from a deep black smoker
A Winogradsky column is used to demonstrate interactions and gradients that occur in aquatic environments
Both (a) and (b)
A Winogradsky column is used to filter out microorganisms from non-aquatic environments

Discuss Question

Answer: Option B. -> A Winogradsky column is used to demonstrate interactions and gradients that occur in aquatic environments

Question 39. . The rate of flux of oxygen in air is __________ to/than the rate of flux of oxygen in water.