Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 53

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Weekly Quiz Competition

Question 1
1 / -0

Critric acid used in production of beverages, toffees, chocolates is by fermentation of ______ by aspergillus niger.

A
grapes

B
sugar molasses

C
apple

D
coffee nuts

Solution

Citric acid present in grapes is used in the production of beverages, toffee and chocolates. It is produced by the fermentation of grapes with the help of aspergillus niger.
So the correct answer is 'Grapes'.
Question 2
1 / -0

Activated sludge should have the ability to settle quickly so that it can

A
Be rapidly pumped back from sedimentation tank aeration tank.

B
Absorb pathogenic Bactria present in waste water while sinking to the bottom of the settling tank

C
Be discarded and anaerobic ally digested

D
Absorb colloidal organic matter

Solution

Activated sludge should have the ability to settle quickly so that it can be rapidly pumped back from sedimentation tank to the aeration tank, where it can start the process of decomposition of the organic matter again. Activated sludge has filamentous bacteria that are capable of performing the aerobic digestion of organic waste is the sewage water.
Hence, the correct answer is 'Be rapidly pumped back from sedimentation tank aeration tank'
Question 3
1 / -0

What happened when wheat field decreases with Rhizobium?

A
No increase in production/nitrogen contents of soil

B
Fertility of soil increases

C
Fertility of soil decreases

D
Increase in production and nitrogen contents of soil

Solution

Rhizobia are soil bacteria that help in fixing of nitrogen for the leguminous plant (Fabaceae). They fix nitrogen after becoming established inside root nodules of the plants. If the wheat field decreases with the rhizobium then the nitrogen fixation will stop which will reduce the nitrogen contents in soil due to which there is no increase in the production of wheat.
Thus the correct option is A.
Question 4
1 / -0

A biological control which is effective biocontrol agent for several plant pathogens :

A
Nucleopolyhedrovirus

B
Tirchoderma

C
Agrobacterium

D
Bacillus

Solution

Trichoderma are fungi and present in the soil as avirulent symbionts.
Agrobacterium has a unique ability to transfer its DNA to the plants and hence it is manipulated by genetic engineering to make the crop pathogen resistance.
But the biocontrol agent for several plant pathogens is Nucleopolyhedrovirus. It is a virus that infects the pests like butterfly, moth, etc.
So the correct answer is ' Nucleopolyhedrovirus'.
Question 5
1 / -0

The Rhizobium bacteria lines inside the root nodules of ________.

A
Pea plant

B
Beans

C
Peanuts

D
All of the above

Solution

Rhizobium bacteria is often found in the roots of legumes which help in nitrogen fixation. So, it is present inside root nodules of peas, beans and peanuts.
Question 6
1 / -0

Chlorine treatment

A
Removes all the air pollutants

B
Disinfects water by killing germs

C
Removes hardness of water

D
All of the above

Solution

Chlorine is a powerful disinfectant that can kill the bacteria and viruses by destabilizing the chemical bonds of the pathogens. So, it is used in purification of water.
Hence, the correct answer is 'Disinfects water by killing germs'
Question 7
1 / -0

In which of the following industries, microbial enzymes are not used?

A
Glass industry

B
Cheese industry

C
Tanning industry

D
Paper industry

Solution

Microbial enzymes are used in several industries where chemical processes take place to manufacture new things. For example, the food industry, medicine industry and in all other related industries respectively but the paper industry does not use a chemical process to manufacture new paper or to recycle the used paper hence microbial enzymes are not used In paper industries.
So the correct option is 'Paper industry'.
Question 8
1 / -0

Anaerobic sludge digesters and inoculums are part and parcel of _____________.

A
Primary sluge

B
Activated sludge

C
BOD

D
FIocs

Solution

Anaerobic digestion is a collection of a process by which microorganism break down biodegradable material in the absence of oxygen and some of these processes are used in the waste Industries to manage the waste. Primary sludge is a result of the capture of suspended solids and organics materials. In the primary process of waste management, the material is treated in a variety of ways. During the biological treatment of the waste a part of activated sludge is used as inoculum and they are passed into the last tank which is known as anaerobic sludge digester. The microorganism present in the sludge gets killed.

So, the correct option is 'Primary sludge'.
Question 9
1 / -0

Late blight of potato is caused by ______ that belongs to class _________.

A
Phytophthora infestans, Oomycetes

B
Helminthosporium oryzae, Deuteromycetes

C
Alternaria solani, Deuteromycetes

D
Albugo candida, Oomycetes

Solution

Late blight disease was a reason for the Irish potato famine in the mid 19th century, is caused by the fungus, pathogen Phytophthora infestans, oomycetes.

So, the correct answer is 'Phytophthora infestans, Oomycetes'
Question 10
1 / -0

Instead of using chemical fertilizers in a paddy field, a farmer thought of employing nitrogen fixation technique. Amongst the following which would be beneficial for his cause?

A
Glycine max - Rhizobium

B
Cycas - Nostoc

C
Casuarina - Frankia

D
Azolla - Anabaena

Solution

Azolla is a pteridophyte, which contains as symbiont the nitrogen-fixing cyanobacterium Anabaena azollae. Widely cultivated in the Asian regions, Azolla is either incorporated into the soil before paddy transplanting or grown as a dual crop along with paddy. Anabaena helps in nitrogen fixation and in turn, helps in the growth of crop fields.
So, the correct option is 'Azolla - Anabaena'.

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Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 53

Result

Microbes in Human Welfare Test - 53

Score

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Rank

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SHARING IS CARING

Question 1

grapes

sugar molasses

apple

coffee nuts

Solution

Question 2

Be rapidly pumped back from sedimentation tank aeration tank.

Absorb pathogenic Bactria present in waste water while sinking to the bottom of the settling tank

Be discarded and anaerobic ally digested

Absorb colloidal organic matter

Solution

Question 3

No increase in production/nitrogen contents of soil

Fertility of soil increases

Fertility of soil decreases

Increase in production and nitrogen contents of soil

Solution

Question 4

Nucleopolyhedrovirus

Tirchoderma

Agrobacterium

Bacillus

Solution

Question 5

Pea plant

Beans

Peanuts

All of the above

Solution

Question 6

Removes all the air pollutants

Disinfects water by killing germs

Removes hardness of water

All of the above

Solution

Question 7

Glass industry

Cheese industry

Tanning industry

Paper industry

Solution

Question 8

Primary sluge

Activated sludge

BOD

FIocs

Solution

Question 9

Phytophthora infestans, Oomycetes

Helminthosporium oryzae, Deuteromycetes

Alternaria solani, Deuteromycetes

Albugo candida, Oomycetes

Solution

Question 10

Glycine max - Rhizobium

Cycas - Nostoc

Casuarina - Frankia

Azolla - Anabaena

Solution

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