Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 39

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Weekly Quiz Competition

Question 1
1 / -0

Organic compound not decomposed by microbes in biogas plants is

A
Protein

B
Lignin

C
Cellulose

D
Phospholipid

Solution

In a biogas plant, the microbes are methanogenic bacteria. They breakdown complex polymers such as carbohydrates, proteins, fats into simpler molecules. They secrete exoenzymes which break the plant and animal cell wall material. Cellulose is degraded by cellulases. Lignin is a complex polysaccharide and so it can't be degraded by biological degradation. It has high content of hemicellulose and has cross linkages. It can be degraded only by some fungi such as actinomycetes or by chemical degradation.
So, the correct answer is 'Lignin'.
Question 2
1 / -0

pH favourable for fermentation in biogas plant is

A
$$4-5$$

B
$$5-6$$

C
$$6.8-7.2$$

D
$$7.6-8.4$$

Solution

Fermentation in biogas plant is carried out by anaerobic bacteria known as methanogens. Optimum pH at which methanogenic bacteria are active is about 6.8 - 8.5. Methane production occurs properly at a pH range of 7.0- 8.0. The pH range at which a fermenter in biogas plant operates is about 6.8- 7.5. pH drops in the fermenter when there is accumulation of fatty acids that are not further broken down into carbon dioxide and water.
So, the correct answer is '6.8- 7.2'.
Question 3
1 / -0

Biogas production is rate limited by

A
Production of methane

B
Cellulose digestion

C
Conversion of monomers to organic acids

D
None of the above
Question 4
1 / -0

During retting of jute fibres, the fermenting microbe is

A
Butyric acid bacteria

B
Streptococcus lactin

C
Helicobacter pylori

D
Methanophilic bacteria.

Solution

Stem and leaf fibres are separated from softer tissues by bacterial action of two types- dew retting (e.g. Pseudomonas fluorescence) and anaerobic retting (e.g. Clostridium or butyric acid bacteria).
Retting of jute fibres is anaerobic retting. The fermenting microbe during this activity is Butyric acid bacteria.
Question 5
1 / -0

Which is useful as biological control ?

A
Mucor mucedo

B
Trichoderma viridae

C
Penicillium notatum

D
Phytophthora parasitica
Question 6
1 / -0

Yield of rice is increased by

A
Sesbania

B
Anabaena

C
Bacillus subtilis

D
B. popillae

Solution

Anabaena resides in the fronds of Azolla ( a water fern) that is grown in the rice fields to increase the efficiency of nitrogen fixation.
Thus, the corrrect answer is B.
Question 7
1 / -0

Temperature suitable for biogas production is

A
$$35^o-40^o$$C

B
$$20^o-25^o$$C

C
$$30^o-35^o$$C

D
$$40^o-44^o$$C

Solution

Biogas production occurs by the action of anaerobic bacteria on waste materials or raw materials. The reactions are made to occur in specially designed large sized tanks called digesters. The bacteria that decompose the raw materials and produce biogas can be thermophilic if they survive at a higher temperature or mesophilic if they survive at a moderate temperature. Mesophilic bacteria are active at an optimum temperature of 35° - 40°C and thermophilic bacteria are active at an optimum temperature of 50° - 55°C .
Hence, option A matches the correct temperature suitable for biogas production.
So, the correct answer is '35° - 40°C'.
Question 8
1 / -0

Methanogens growing anaerobically on cellulosic material produce

A
Methane

B
Methane and hydrogen

C
Methane and carbon dioxide

D
Methane, carbon dioxide and hydrogen
Question 9
1 / -0

Primary treatment of sewage is

A
Physical process

B
Biological process

C
Chemical process

D
Biochemical process
Solution
A. Correct option - A
B. Explanation for correct option -
Primary treatment of sewage includes the physical separation of suspended solids leads to the reduction of biological oxygen demand from a waste stream ,
This basically involves physical removal of particles from sewage, through filtration and sedimentation.
Hence the correct option is Physical process.
Question 10
1 / -0

The process that provides both energy and manure is

A
Burning of fuel wood

B
Pyrolysis of wood

C
Gasification of wood and wood shavings

D
Biogas formation

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Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 39

Result

Microbes in Human Welfare Test - 39

Score

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Rank

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SHARING IS CARING

Question 1

Protein

Lignin

Cellulose

Phospholipid

Solution

Question 2

$$4-5$$

$$5-6$$

$$6.8-7.2$$

$$7.6-8.4$$

Solution

Question 3

Production of methane

Cellulose digestion

Conversion of monomers to organic acids

None of the above

Question 4

Butyric acid bacteria

Streptococcus lactin

Helicobacter pylori

Methanophilic bacteria.

Solution

Question 5

Mucor mucedo

Trichoderma viridae

Penicillium notatum

Phytophthora parasitica

Question 6

Sesbania

Anabaena

Bacillus subtilis

B. popillae

Solution

Question 7

$$35^o-40^o$$C

$$20^o-25^o$$C

$$30^o-35^o$$C

$$40^o-44^o$$C

Solution

Question 8

Methane

Methane and hydrogen

Methane and carbon dioxide

Methane, carbon dioxide and hydrogen

Question 9

Physical process

Biological process

Chemical process

Biochemical process

Solution

Question 10

Burning of fuel wood

Pyrolysis of wood

Gasification of wood and wood shavings

Biogas formation

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