DAPZOI
Home Topics Quiz Login


Microbes in Aquatic Environment MCQ Questions & Answers

Microbes in Aquatic Environment MCQs : This section focuses on the "Microbes in Aquatic Environment". These Multiple Choice Questions (MCQs) should be practiced to improve the Microbes in Aquatic Environment skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

The Redfield ratio is an index of concentration of

A. carbon, hydrogen and oxygen
B. nitrogen, potassium and iron
C. carbon, nitrogen and phosphorous
D. carbon, phosphorous and sulfur

View Answer

Question 2

Removal of solids is generally considered as a

A. Primary treatment
B. Secondary treatment
C. Tertiary treatment
D. None of these

View Answer

Question 3

All of the following species are considered coliforms except

A. Enterobacter aerogenes
B. Klebsiella pneumoniae
C. Salmonella typhi
D. Escherichia coli

View Answer

Question 4

The sulfur pearl of Namibia, Thiomargarita namibiensis

A. is the worlds largest bacterium
B. stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
C. Both A and B
D. is the worlds smallest bacterium

View Answer

Question 5

Chemical precipitation of phosphorus is

A. primary treatment
B. secondary treatment
C. tertiary treatment
D. Both A and B

View Answer

Question 6

Which of the following is correct?

A. Ultramicrobacteria or nanobacteria are the dominant bacteria in marine systems
B. secondary treatmentUltramicrobacteria or nanobacteria are so numerous that they are a major food source for heterotrophic flagellates
C. Both A and B
D. None of these

View Answer

Question 7

Coliforms are used as indicator organisms because

A. they are present wherever enteric pathogens are present
B. a testing procedure with great specificity is easy to perform
C. Both A and B
D. None of these

View Answer

Question 8

Hyphomycete fungi

A. produce nonmotile tetaradiate conidia
B. grow in leaves and the infected leaves are the preferred food source for some aquatic insects
C. Both A and B
D. None of these

View Answer

Question 9

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

A. greater
B. lesser
C. approximately equal
D. half

View Answer

Question 10

Metabolism of dissolved organic material released by phytoplankton allows heterotrophic bacteria to become part of the particulate organic matter that is passed up the food web to be metabolized and released as mineral elements and CO2 at each transfer. This sentence describes the

A. microbial loop
B. Winogradsky column
C. Redfield ratio
D. Gibbs free energy

View Answer

Question 11

Which of the following is correct?

A. All members of Hyphomycetes are also members of Fungi, but not all members of Fungi are members of Hyphomycetes
B. All members of Fungi are also members of Hyphomycetes, but not all members of Hyphomycetes are members of Fungi
C. All members of Hyphomycetes are members of Fungi, and all members of Fungi are members of Hyphomycetes
D. No member of Hyphomycetes is a member of Fungi

View Answer

Question 12

The amount of oxygen dissolved in hypolimnion water in the winter is __________ to/than the amount of oxygen dissolved in hypolimnion water in the summer

A. greater
B. lesser
C. approximately equal to
D. half

View Answer

Question 13

Members of all of the following genera of bacteria typically are found in a maturing Winogradsky column except

A. Clostridium
B. Rhodospirillum
C. Chlorobium
D. Escherichia

View Answer

Question 14

Because it can be used with a variety of media and allow a resuscitation step the __________ technique has become the common and often preferred method of evaluating the microbiological characteristics of water.

A. most probable number
B. Winogradsky
C. MUG
D. membrane filtration

View Answer

Question 15

Which of the following is correct?

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

View Answer

Question 16

Trickling filter comes under

A. primary treatment
B. secondary treatment
C. tertiary treatment
D. None of these

View Answer

Question 17

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

A. E.coli
B. Fecal Streptococci
C. Clostridium perfringens
D. All of the above

View Answer

Question 18

Activated sludge undergoes

A. Primary treatment
B. Secondary treatment
C. Tertiary treatment
D. Any of the above

View Answer

Question 19

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

A. greater
B. lesser
C. approximately equal
D. half

View Answer

Question 20

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

A. low oxygen diffusion environment; soils
B. high oxygen diffusion environment; soils
C. low oxygen diffusion environment; lakes
D. high oxygen diffusion environment; lakes

View Answer

Question 21

Activated sludge undergoes

A. Primary treatment
B. Secondary treatment
C. Tertiary treatment
D. any of these

View Answer

Question 22

Chemical precipitation of phosphorus is

A. primary treatment
B. secondary treatment
C. tertiary treatment
D. both (a) and (b)

View Answer

Question 23

Coliforms are used as indicator organisms because

A. they are present wherever enteric pathogens are present
B. a testing procedure with great specificity is easy to perform
C. both (a) and (b)
D. none of the above

View Answer

Question 24

Hyphomycete fungi

A. produce nonmotile tetaradiate conidia
B. grow in leaves and the infected leaves are the preferred food source for some aquatic insects
C. both (a) and (b)
D. none of the above

View Answer

Question 25

The sulfur pearl of Namibia, Thiomargarita namibiensis

A. is the worlds largest bacterium
B. stores high concentrations of nitrate in a huge internal vacuole which takes up 98% of the organisms volume
C. Both (a) and (b)
D. is the worlds smallest bacterium

View Answer

Question 26

Which of the following is correct?

A. Ultramicrobacteria or nanobacteria are the dominant bacteria in marine systems
B. Ultramicrobacteria or nanobacteria are so numerous that they are a major food source for heterotrophic flagellates
C. Both (a) and (b)
D. none of the above

View Answer

Question 27

Which of the following is correct?

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

View Answer

Question 28

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

A. E.coli
B. Fecal Streptococci
C. Clostridium perfringens
D. All of these

View Answer