Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 43

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Weekly Quiz Competition

Question 1
1 / -0

Secondary sewage treatment is mainly

A
Chemical process

B
Mechanical process

C
Biological process

D
Physical process
Solution
- Sewage treatment is a process in which sewage is treated in order to remove its harmful constituents and making it environmentally safe.
- The secondary treatment is carried by certain microorganisms which remove all the suspended and dissolved biological matter. Chlorination is done to remove microorganisms from the effluent prior to its discharge for the tertiary treatment.
So, the correct option is 'Biological process'.
Question 2
1 / -0

Domestic sewage of large cities.

A
Has very high amount of suspended solids and dissolved salts

B
When treated in sewage treatment plant does not require aeration

C
Has high BOD as it contains both aerobic and anaerobic bacteria

D
Is processed by aerobic and then anaerobic bacteria in secondary treatment in sewage treatment plant

Solution

Domestic sewage is processed in 3 stages first by aerobic and then by anaerobic bacteria.
Correct answer-D
Question 3
1 / -0

Lactic acid bacteria grow in milk and convert it into curd increasing its nutritional value by increasing.

A
Vitamin A

B
Vitamin $$B_6$$

C
Vitamin $$B_{12}$$

D
Both A and C

Solution

It helps in the enhancement of vit B12.
Correct answer-C

Question 4

1 / -0

Match the columns and choose the correct option.

	Column I		Column II
(i)	Aspergillus niger	(a)	Ethanol
(ii)	Clostridium butylicum	(b)	Statins
(iii)	Saccharomyces cerevisiae	(c)	Citric acid
(iv)	Trichoderma polysporum	(d)	Butyric acid
(v)	Monascus purpureus	(e)	Cyclosporin A

i-d, ii-c, iii-b, iv-a, v-c

i-e, ii-d, iii-a, iv-b, v-c

i-c, ii-d, iii-a, iv-e, v-b

i-c, ii-d, iii-e, iv-a, v-b

i-b, ii-c, iii-d, iv-e, v-a

Solution

Aspergillus niger-Citric acid

Clostridium butylicum-Butyric acid

Saccharomyces cerevisiae-Ethanol,fermentation

Trichoderma polysporum-Cyclosporin A,immunosuppressant

Monascus prupureus-Statins,blood cholestrol lowering agent

Correct answer-C

Question 5
1 / -0

A peculiar odour that occurs in marshy areas and cowsheds is due to gas produced by.

A
Cyanobacteria

B
Archaebacteria

C
Mycoplasma

D
Slime Moulds

Solution

The odour is due to the gases produced by the bacteria Methanogens which belong to Archaebacteria.
Correct answer-B
Question 6
1 / -0

In paddy fields, biological nitrogen fixation is chiefly brought about by.

A
Cyanobacteria

B
Green algae

C
Mycorrhiza

D
Rhizobium

Solution

In paddy fields,biological nitrogen fixation is brought about by Cyanobacteria(Nostoc, Anabaena).
Correct answer-A
Question 7
1 / -0

Which is not used as a biopesticide?

A
Xanthomonas campesteris

B
Bacillus thuringiensis

C
Trichoderma harzianum

D
Nucleo polyhedrosis virus
Solution
A.Correct option: A
B. Explanation for correct option: Xanthomonas campestris is not used as a biopesticide because it is a plant pathogen.
- Thus, it is not a biopesticide.
C. Explanation for incorrect option:
Option B: Biopesticides are certain types of pesticides made up of living microorganisms.
Bacillus thuringiensis (or Bt) is a biopesticide that can block the gut of insects and kill them.
Option C: Trichoderma harzianum: This is a bio-pesticide useful for the management of fungal pathogens such as Fusarium species and Phytophthora species as well as nematodes.
Option D: The nuclear polyhedrosis virus (NPV) which belongs to the family Baculoviruses is a virus affecting insects, predominantly moths and butterflies. It has been used as a pesticide for crops infested by insects susceptible to contraction.
Question 8
1 / -0

Viruses of genus Nucleopolyhedrovirus are employed as.

A
Gobar gas producers

B
Biological control agents

C
Anaerobic sludge digesters

D
Antibiotics

E
Atmospheric nitrogen fixing agents

Solution

Viruses of genus Nucleopolyhedrovirus , Baculoviruses are species-specific narrow spectrum biocontrol agents for plant pathogens.
Correct answer-B
Question 9
1 / -0

The microbe Pseudomonas denitrificans produces which vitamin?

A
K

B
D

C
$$B_2$$

D
$$B_{12}$$

Solution

Option D is correct.
The Microbe Psuedomonas denitrificans produced $$B_{12}$$ vitamin. The aerobic Psuedomonas denitrificans is widely used for industrial and commercial vitamin $$B_{12}$$ fermentation due to its higher productivity compared to the anaerobic vitamin $$B_{12}$$ producing microorganisms.
Psuedomonas denitrificans is one of the free microorgansms that can synthesize vitamin $$B_{12}$$ under aerobic conditions. It is also capable of performing denitrification as a part of nitrogen cycle.
Question 10
1 / -0

Fungus used in preparing soy sauce is?

A
Agaricus

B
Aspergillus

C
Penicillium

D
Saccharomyces

Solution

Aspergillus used for fermenting various substances are used in the preparation of soy sauce.
Correct answer-B

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Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 43

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Microbes in Human Welfare Test - 43

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Question 1

Chemical process

Mechanical process

Biological process

Physical process

Solution

Question 2

Has very high amount of suspended solids and dissolved salts

When treated in sewage treatment plant does not require aeration

Has high BOD as it contains both aerobic and anaerobic bacteria

Is processed by aerobic and then anaerobic bacteria in secondary treatment in sewage treatment plant

Solution

Question 3

Vitamin A

Vitamin $$B_6$$

Vitamin $$B_{12}$$

Both A and C

Solution

Question 4

i-d, ii-c, iii-b, iv-a, v-c

i-e, ii-d, iii-a, iv-b, v-c

i-c, ii-d, iii-a, iv-e, v-b

i-c, ii-d, iii-e, iv-a, v-b

i-b, ii-c, iii-d, iv-e, v-a

Solution

Question 5

Cyanobacteria

Archaebacteria

Mycoplasma

Slime Moulds

Solution

Question 6

Cyanobacteria

Green algae

Mycorrhiza

Rhizobium

Solution

Question 7

Xanthomonas campesteris

Bacillus thuringiensis

Trichoderma harzianum

Nucleo polyhedrosis virus

Solution

Question 8

Gobar gas producers

Biological control agents

Anaerobic sludge digesters

Antibiotics

Atmospheric nitrogen fixing agents

Solution

Question 9

K

D

$$B_2$$

$$B_{12}$$

Solution

Question 10

Agaricus

Aspergillus

Penicillium

Saccharomyces

Solution

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