Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 37

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Weekly Quiz Competition

Question 1
1 / -0

Who developed the treatment technique for industrial and sewage waste water?

A
NEERI

B
NACO

C
WHO

D
ISRO
Solution
- The National Environmental Engineering Research Institute (NEERI) has developed a technology to treat wastewater generated from industries and sewage.
- This technology has proved to be extremely effective in removing organic pollutants in the case of chemical industries.
So, the correct answer is option A.
Question 2
1 / -0

Which one of the following microbes is the source for vitamin C?

A
Pseudomonas sp.

B
Acetobacter sp.

C
Aspergillus sp.

D
Chlorella

Solution

Acetobacter sp. is a genus of acetic acid bacteria. It is gram negative and moves using peritrichous flagella. It helps in the conversion of ethanol to acetic acid. It is a source of Vitamin-C.
So, the correct answer is 'Acetobacter sp'.
Question 3
1 / -0

Monascus purpureus is a yeast used commercially in the production of

A
Ethanol

B
Streptokinase for remaining of dots from blood vessels

C
Cirtric acid

D
Blood cholestrol lowering statins

Solution

Manescus purpureus is a yeast used commercially in the production of blood cholesterol lowering statins. It is fungus most important because of its use in the form of red yeast rice in the production of fermented food in China. Discoveries of cholesterol-lowering statins produced by this would have prompted research into its possible medical uses.
Question 4
1 / -0

Which one of the following is used in the production of citric acid?

A
Aspergillus niger

B
Rhizopus arrhizus

C
Acetobacter aceti

D
Saccharomyces cerevisiae

Solution

Aspergillus niger is a filamentous fungus that causes the disease on vegetables and fruits called black mould. These organisms are used in fermentation processes to obtain citric acid and gluconic acid that are of commercial importance. Thus the correct answer is option A.
Question 5
1 / -0

The $$CO_2$$ content in biogas ranges from

A
$$10 - 14\%$$

B
$$15 - 45\%$$

C
$$50 -60\%$$

D
$$70 - 80\%$$
Solution
- Biogas is a gaseous fuel that is a mixture of different gasses produced by the breakdown of organic matter such as domestic and animal waste anaerobically.
- This fuel mainly consists of methane, carbon dioxide, sulfide, and hydrogen. The composition of carbon dioxide is around 35%.
  Thus the correct answer is option B.
Question 6
1 / -0

Which one of the following is the correct order of conversion of waste materials during biogas formation?

A
Monomers $$\rightarrow$$ polymers $$\rightarrow$$ methane $$\rightarrow$$ organic acids

B
Organic acids $$\rightarrow$$ methane $$\rightarrow$$ polymers $$\rightarrow$$ monomers

C
Methane $$\rightarrow$$ organic acids $$\rightarrow$$ polymers $$\rightarrow$$ monomers

D
Polymers $$\rightarrow$$ monomers $$\rightarrow$$ organic acid $$\rightarrow$$ methane

Solution

Biogas is made from the microbial degradation of organic matter under anaerobic conditions. The organic matter is present in the form of polymers which includes carbohydrates, fats and proteins. These are broken down into monomers such as sugars, fatty acids and amino acids respectively. The next step is acidogenesis and acetogenesis in which small inorganic acids are formed. The final step is methanogenesis resulting in the formation of biogas that is a mixture of gasses such methane and carbon dioxide. This biogas can be used as fuel for various processes. Thus the correct answer is option D.
Question 7
1 / -0

In the treatment of waste water discharge, which treatment stage involves biological treatment?

A
Primary treatment

B
Secondary treatment

C
Tertiary treatment

D
Reservoir osmosis stage

Solution

Secondary treatment involves biological treatment of the waste water discharge. It involves the removal of dissolved and colloidal compounds by oxidation. It is usually done through microorganisms for removal of organic compounds. The three methods involved in secondary treatment are:
(i) Biofiltration
(ii) Aeration/activated sludge process
(iii) Oxidation ponds.
So, the correct answer is 'Secondary treatment'
Question 8
1 / -0

Citric acid is got from :

A
Aspergillus niger

B
Polyporus species

C
Penicillium notatum

D
Saccharomyces cerevisiae

Solution
Question 9
1 / -0

Storage grains produce aflatoxin due to growth of

A
Virus

B
Yeast

C
Bacterium

D
Aspergillus flavis

Solution

Aflatoxin is a family of toxins produced by certain fungi that are found on agricultural crops such as maize. The main fungi that produce aflatoxin are Aspergillus flavus and Aspergillus parasiticus, which are abundant in warm and humid regions of the world.
So, the correct option is 'Aspergillus flavis'.
Question 10
1 / -0

The fixation of free nitrogen from the air in the nodules of roots of leguminous plants is done by symbiotic bacteria

A
Azotobacter

B
Rhizobium

C
Bacillus subtilis

D
Micrococcus

Solution

Nitrogen fixation is the process of fixation of free nitrogen from the atmosphere. This is done by symbiotic bacteria like Rhizobium. They are in symbiotic association with the the root nodules. They provide nitrogen to the plant. In return, they get shelter from the plant. Azotobacter are free living nitrogen fixing bacteria.
Thus, the correct answer is 'Rhizobium.'

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Microbes in Human Welfare Test - 37

Result

Microbes in Human Welfare Test - 37

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SHARING IS CARING

Question 1

NEERI

NACO

WHO

ISRO

Solution

Question 2

Pseudomonas sp.

Acetobacter sp.

Aspergillus sp.

Chlorella

Solution

Question 3

Ethanol

Streptokinase for remaining of dots from blood vessels

Cirtric acid

Blood cholestrol lowering statins

Solution

Question 4

Aspergillus niger

Rhizopus arrhizus

Acetobacter aceti

Saccharomyces cerevisiae

Solution

Question 5

$$10 - 14\%$$

$$15 - 45\%$$

$$50 -60\%$$

$$70 - 80\%$$

Solution

Question 6

Monomers $$\rightarrow$$ polymers $$\rightarrow$$ methane $$\rightarrow$$ organic acids

Organic acids $$\rightarrow$$ methane $$\rightarrow$$ polymers $$\rightarrow$$ monomers

Methane $$\rightarrow$$ organic acids $$\rightarrow$$ polymers $$\rightarrow$$ monomers

Polymers $$\rightarrow$$ monomers $$\rightarrow$$ organic acid $$\rightarrow$$ methane→

Solution

Question 7

Primary treatment

Secondary treatment

Tertiary treatment

Reservoir osmosis stage

Solution

Question 8

Aspergillus niger

Polyporus species

Penicillium notatum

Saccharomyces cerevisiae

Solution

Question 9

Virus

Yeast

Bacterium

Aspergillus flavis

Solution

Question 10

Azotobacter

Rhizobium

Bacillus subtilis

Micrococcus

Solution

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Polymers $$\rightarrow$$ monomers $$\rightarrow$$ organic acid $$\rightarrow$$ methane