Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 2

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Weekly Quiz Competition

Question 1
4 / -1

The given figure represents a typical biogas plant. Select the correct option for A, B and C respectively.

A
A is the inlet for cattle dung.

B
C is the outlet for the release of biogas.

C
B is the chamber which contains leftover slurry.

D
All of these.

Solution

A - Inlet for cattle dung and water
B - Gas holder
C - Outlet for leftover slurry
Question 2
4 / -1

Process of biogas production is:

A
Aerobic process

B
Anaerobic process

C
Active process

D
Passive process

Solution

Biogas is a methane-rich fuel gas produced by anaerobic breakdown or digestion of biomass with the help of methanogenic bacteria. Biogas is made up of methane (50-70%), carbon dioxide (30%-40%) with traces of nitrogen, hydrogen sulphide and hydrogen.
Question 3
4 / -1

Which of the following bacteria is present in the rumen of cattle?

A
Azotobacter

B
Rhizobium

C
Methanobacterium

D
Azospirillum

Solution

Methanobacterium is found in the rumen (a part of the stomach) of cattle. A lot of cellulosic material is also available in the rumen. In rumen, these bacteria help in the breakdown of cellulose and play an important role in nutrition of cattle.
Question 4
4 / -1

Match column I with column II and select the correct answer from the codes given below:

A
A-(ii), B-(iv), C-(iii), D-(i)

B
A-(iv), B-(iii), C-(ii), D-(i)

C
A-(ii), B-(i), C-(iv), D-(iii)

D
A-(iii), B-(iv), C-(i), D-(ii)
Solution
Methanogens produce methane.
Fermentors are large vessels for growing microbes.
Organic waste in water increase BOD.
Biogas is methane rich fuel gas.
Question 5
4 / -1

Which of the following statements is incorrect?

A
Word antibiotic is a misnomer. Anti Is a Greek word that means 'against', and bios means 'life', together they mean 'against life' (in the context of disease-causing organisms); whereas with reference to human beings, they are 'pro life' and not against

B
Flocs are masses of bacteria with interwoven fungal filaments which form mesh-like structures

C
Components of biogas are methane (50 70%); carbon dioxide (30-40%) and traces of hydrogen, nitrogen and H₂S

D
None of these

Solution

Word antibiotic is a misnomer. Anti is a Greek word that means 'against', and bios means 'life', together they mean 'against life' (in the context of disease-causing organisms); whereas with reference to human beings, they are 'pro life' and not against. Flocs are masses of bacteria with interwoven fungal filaments which form mesh-like structures. Components of biogas are methane (50 70%); carbon dioxide (30-40%) and traces of hydrogen, nitrogen and H₂S.
Question 6
4 / -1

These bacteria grow anaerobically on cellulosic material, produce large amount of methane along with CO₂ and H₂and are collectively called as methanogens. Examples of such bacteria are:

A
Methanobacterium

B
Mathanobrevibacter

C
Methanococcus

D
All of these

Solution

Methanogens are microorganisms that produce methane as a metabolic by product in anoxic condition. They include Methanobacterium, Methanobrevibacter and Methanococcus.
Question 7
4 / -1

Biogas generation is a three-stage anaerobic digestion of animal and other organic wastes. Study the following flow chart and select the correct option for stages I, II and Ill.

A
In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.

B
In stage - II, monomers are converted into organic acids by fermentation causing microbes.

C
In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.

D
All of these.

Solution

In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.
In stage - II, monomers are converted into organic acids by fermentation causing microbes.
In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.
Question 8
4 / -1

Study the following statements and select the incorrect ones.
(i) Physical removal of large and small particles through filtration and sedimentation is called primary sewage treatment.
(ii) Secondary sewage treatment is mainly a mechanical process.
(iii) Activated sludge sediment in a sewage treatment plant is a rich source of aerobic bacteria.
(iv) Biogas, commonly called as gobar gas, is pure methane.

A
(i) and (ii)

B
(ii) and (iv)

C
(ii) and (iii)

D
(iii) and (iv)

Solution

Secondary treatment is also called biological treatment or microbial degradation. It is mainly a biological process. Biogas is a mixture of gases, containing predominantly methane (50-70%), CO₂ (30-40%) and traces of hydrogen, H₂S and nitrogen.
Question 9
4 / -1

Biogas is produced by:

A
Aerobic breakdown of biomass

B
Anaerobic breakdown of biomass

C
With the help of methanogenic bacteria

D
Both (b) and (c)
Solution
Biogas is a methane rich fuel gas produced by anerobic breakdown or digestion of biomass with the help of methanogenic bacteria.
Biogas is a mixture of gases, containing predominantly methane (50-70%), CO₂ (30-40%) and traces of hydrogen, H₂S and nitrogen.
Question 10
4 / -1

Match column I with column II and select the correct option from the codes given below.

A
A−(iii), B−(i), C−(iv), D−(ii)

B
A−(i), B−(iii), C−(iv), D−(ii)

C
A−(iii), B−(ii), C−(iv), D−(i)

D
A−(iii), B−(i), C−(ii), D−(iv)

Solution

Strains are produced by Monascus purpureus. Dung is used to producing Biogas. Saccharomyces cerevisiae is used in the production of ethanol. Cyclosporin A is obtained from Trichoderma polysporum.

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Microbes in Human Welfare Test - 2

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Microbes in Human Welfare Test - 2

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SHARING IS CARING

Question 1

A is the inlet for cattle dung.

C is the outlet for the release of biogas.

B is the chamber which contains leftover slurry.

All of these.

Solution

Question 2

Aerobic process

Anaerobic process

Active process

Passive process

Solution

Question 3

Azotobacter

Rhizobium

Methanobacterium

Azospirillum

Solution

Question 4

A-(ii), B-(iv), C-(iii), D-(i)

A-(iv), B-(iii), C-(ii), D-(i)

A-(ii), B-(i), C-(iv), D-(iii)

A-(iii), B-(iv), C-(i), D-(ii)

Solution

Question 5

Word antibiotic is a misnomer. Anti Is a Greek word that means 'against', and bios means 'life', together they mean 'against life' (in the context of disease-causing organisms); whereas with reference to human beings, they are 'pro life' and not against

Flocs are masses of bacteria with interwoven fungal filaments which form mesh-like structures

Components of biogas are methane (50 70%); carbon dioxide (30-40%) and traces of hydrogen, nitrogen and H2S

None of these

Solution

Question 6

Methanobacterium

Mathanobrevibacter

Methanococcus

All of these

Solution

Question 7

In stage - I, anaerobic microorganisms bring about enzymatic breakdown of complex organic compounds into simple soluble compounds or monomers.

In stage - II, monomers are converted into organic acids by fermentation causing microbes.

In stage - Ill, organic acids are acted upon by methanogenic bacteria to produce biogas.

All of these.

Solution

Question 8

(i) and (ii)

(ii) and (iv)

(ii) and (iii)

(iii) and (iv)

Solution

Question 9

Aerobic breakdown of biomass

Anaerobic breakdown of biomass

With the help of methanogenic bacteria

Both (b) and (c)

Solution

Question 10

A−(iii), B−(i), C−(iv), D−(ii)

A−(i), B−(iii), C−(iv), D−(ii)

A−(iii), B−(ii), C−(iv), D−(i)

A−(iii), B−(i), C−(ii), D−(iv)

Solution

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Components of biogas are methane (50 70%); carbon dioxide (30-40%) and traces of hydrogen, nitrogen and H₂S