Microbes in Human Welfare Test

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Microbes in Human Welfare Test - 55

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following statement is incorrect?

A
Biofertilizers are used to maintain and improve soil fertility

B
Chemical fertilizers pollute soil and water resources

C
Chemical fertilizers are expensive

D
Most pesticide used these days are specific in nature
Solution
Correct Answer: (D) Most pesticides used these days are specific in nature.
Explanation:
Biofertilizers are fertilizers that contain living microbes.
When they are sprayed over the crops or the soil they help the host plant by providing them with adequate nutrient that is needed for its growth.
So, biofertilizers are used to improve soil quality as well as crop productivity.
Chemical fertilizers contain many harmful chemical contents that are harmful to many other organisms including humans.
The phenomenon of biological magnification is closely related to the use of chemical fertilizers.
So, the use of chemical fertilizers causes soil and water pollution.
Chemical fertilizers are also expensive.
Pesticides used in the present era are generally not specific and target a variety of pests.
Hence, option (D) is the incorrect statement and the correct answer.
Question 2
1 / -0

Which of the following is correct about biogas?

A
Methane gas is produced along with ethyl alcohol by methanogen

B
Methanogens acts on cellulose and release biogas

C
Biogas is produced by thunder and lightening

D
Maximum gas found in biogas is $$CO_2$$
Solution
- Methanogens are present in the rumen of cattle that is present in dung as well. Methanogens acts on the cellulose content of the and It helps in the production of methane gas that is a component of biogas.
- Hence Methanogens acts on cellulose and release biogas is a correct statement.
- So, the correct answer is 'Methanogens acts on cellulose and release biogas'.
Question 3
1 / -0

Secondary treatment is also known as ________________.

A
Biological Treatment

B
Preliminary Treatment

C
Secondary Treatment

D
Tertiary Treatment

Solution

Secondary treatment is a treatment process for wastewater (or sewage) to achieve a certain degree of effluent quality by using a sewage treatment plant with physical phase separation to remove settleable solids and a biological process to remove dissolved and suspended organic compounds. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction.
So the correct answer is option A.
Question 4
1 / -0

In secondary treatment, solid reducers, ranges from

A
70-92%

B
80-90%

C
20-60%

D
10-70%
Question 5
1 / -0

The microorganisms involved in floc formation during sewage treatment are

A
Anaerobic bacteria and fungus

B
Aerobic bacteria and fungus

C
Autotrophic bacteria and yeast

D
Fungus and algae

Solution

Flocs are masses of aerobic bacteria and fungi that help in biological treatment of sewage.
So, the correct answer is 'Aerobic bacteria and fungus'
Question 6
1 / -0

Secondary treatment is carried out for removal of;

A
Suspended solids

B
Dissolved organic matters

C
Floating materials

D
Solid impurities
Question 7
1 / -0

The gases produced in a digestion tank have --------.

A
Calorific value

B
Density

C
Gas Value

D
Digestion Value

Solution

A. Calorific value
EXPLANATION: In a digestion tank, produced gases have a high calorific value. This value is enough to find use in many energy applications, including power generation. The calorific value of biogas is 35000-40000 kJ/kg.
Question 8
1 / -0

Which of the following is correct?

A
Cyanobacteria makes mycorrhiza which absorbs phosphate from soil

B
Azotobacter is symbiotic nitrogen fixing bacteria

C
In paddy field, cyanobacteria is used to decrease soil microbes

D
Methanobacterium feed cellulose in anaerobic condition
Solution
- Certain bacteria, which grow anaerobically on cellulosic material, produce a large amount of methane along with $$CO_2$$ and $$H_2$$. These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium.
- These bacteria are present in the rumen (a part of the stomach) of cattle. A lot of cellulosic material present in the food of cattle is also present in the rumen. In the rumen, these bacteria help in the breakdown of cellulose and play an important role in the nutrition of cattle.
- Hence Methanobacterium feed cellulose in the anaerobic condition is a true statement.
- So, the correct answer is 'Methanobacterium feed cellulose in anaerobic condition'.
Question 9
1 / -0

The gas released during the preparation of bread is

A
Oxygen

B
Nitrogen

C
Carbon dioxide

D
Sulphur dioxide

Solution

$$CO_2$$ (Carbon dioxide) is released when bread is baked. During fermentation yeast cells produce Carbon dioxide rapidly, which forms the pores in the bread.
So, the correct answer is 'Carbon dioxide'
Question 10
1 / -0

Biofertilizers include

A
Cowdung manure and farmyard waste

B
A quick growing crop ploughed back

C
BGA/Anabaena azollae

D
All of the above

Solution

Biofertilizers are the substances which contain living microorganisms which help in improving the yield. These forms of fertilizers improve the soil quality by microbial activity. They help in increasing the mineral solubilization, nitrogen fixation and cellulose decomposition. Many species of cyanobacteria are used as biofertilizers and help in nitrogen fixation. The species of cyanobacteria called as Anabaena azollae is commonly used in paddy fields for improving the quality and amount of yield.
Thus, the correct answer is option C.

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Re-Attempt Weekly Quiz Competition

Microbes in Human Welfare Test - 55

Result

Microbes in Human Welfare Test - 55

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SHARING IS CARING

Question 1

Biofertilizers are used to maintain and improve soil fertility

Chemical fertilizers pollute soil and water resources

Chemical fertilizers are expensive

Most pesticide used these days are specific in nature

Solution

Question 2

Methane gas is produced along with ethyl alcohol by methanogen

Methanogens acts on cellulose and release biogas

Biogas is produced by thunder and lightening

Maximum gas found in biogas is $$CO_2$$

Solution

Question 3

Biological Treatment

Preliminary Treatment

Secondary Treatment

Tertiary Treatment

Solution

Question 4

70-92%

80-90%

20-60%

10-70%

Question 5

Anaerobic bacteria and fungus

Aerobic bacteria and fungus

Autotrophic bacteria and yeast

Fungus and algae

Solution

Question 6

Suspended solids

Dissolved organic matters

Floating materials

Solid impurities

Question 7

Calorific value

Density

Gas Value

Digestion Value

Solution

Question 8

Cyanobacteria makes mycorrhiza which absorbs phosphate from soil

Azotobacter is symbiotic nitrogen fixing bacteria

In paddy field, cyanobacteria is used to decrease soil microbes

Methanobacterium feed cellulose in anaerobic condition

Solution

Question 9

Oxygen

Nitrogen

Carbon dioxide

Sulphur dioxide

Solution

Question 10

Cowdung manure and farmyard waste

A quick growing crop ploughed back

BGA/Anabaena azollae

All of the above

Solution

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