Microorganisms Friend And Foe Test

Result

Microorganisms Friend And Foe Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

The chemicals that are used to control weeds are called ______.

A
Fertilisers

B
Manures

C
Pesticides

D
Weedicides

Solution

Weeds are controlled by using certain chemicals, called weedicides, like 2,4-D. Hence, D is the correct answer.
Question 2
1 / -0

The crops which are sown in the rainy season are called ____.

A
Kharif crops

B
Rabi crops

C
Rainy crops

D
Weeds

Solution

The crops which are sown in the rainy season are called kharif crops. The rainy season in India is generally from June to September. Paddy, maize, soya bean, groundnut and cotton are kharif crops. Hence, A is the correct answer.
Question 3
1 / -0

Which of the following is a process of loosening and turning of the soil?

A
Harvesting

B
Tilling

C
Winnowing

D
Irrigation

Solution

The process of loosening and turning of the soil is called tilling or ploughing. This is done by using a plough. Hence, B is the correct answer.
Question 4
1 / -0

Which of the following is a method to know the damaged seeds?

A
Damaged seeds do not flow on water

B
Damaged seeds are shiny

C
Damaged seeds are not shiny

D
Damaged seeds float on water

Solution

Damaged seeds become hollow and are thus lighter. Therefore, they float on water. Hence, D is the correct answer.
Question 5
1 / -0

What is the main function of manures and fertilisers?

A
To protect crops from insects and weeds.

B
To provide seeds with a good amount of water.

C
To provide proper nutrients to crops for growth.

D
To help crops in photosynthesis.

Solution

The substances which are added to the soil in the form of nutrients for the healthy growth of plants are called manure and fertilisers. Hence, C is the correct answer.
Question 6
1 / -0

The chemicals used to check for growth of microorganisms is called?

A
Pasteurization

B
Chemicals

C
Preservation

D
None of the above

Solution

The chemicals generally used to check the growth of microorganisms is called Preservatives.

Hence Option D is correct.
Question 7
1 / -0

Nitrogen is essential constituents of all living organisms. It is not a part of which of the following?

A
Protein

B
Vitamins

C
Minerals

D
Chlorophyll

Solution

Nitrogen is one of the essential constituents of all living organisms as a part of proteins, chlorophyll, nucleic acid and vitamins.

Hence Option C is correct.
Question 8
1 / -0

Why does flour rises when yeast is used?

A
Yeast reproduces rapidly

B
Yeast produces carbon dioxide during respiration.

C
both A and B

D
None of the above

Solution

Yeast reproduces rapidly and produces carbon dioxide during respiration. Bubbles of the gas fill the dough and increase its volume.

Hence Option C is correct.
Question 9
1 / -0

In pasteurization at what temperature the milk is boiled?

A
50°C

B
60°C

C
70°C

D
80°C

Solution

The milk is heated to about 70°C for 15 to 30 seconds and then suddenly chilled and stored. By doing so, it prevents the growth of microbes. It is called pasteurization.

Hence Option C is correct.
Question 10
1 / -0

The following list shows the commonly known antibiotics made from fungi and bacteria. Chose the incorrect option?

A
Streptomycin

B
tetracycline

C
erythromycin

D
All of the above

Solution

Streptomycin, tetracycline, and erythromycin are some of the commonly known antibiotics which are made from fungi and bacteria.

Hence Option D is correct

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Re-Attempt Weekly Quiz Competition

Microorganisms Friend And Foe Test - 7

Result

Microorganisms Friend And Foe Test - 7

Score

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SHARING IS CARING

Question 1

Fertilisers

Manures

Pesticides

Weedicides

Solution

Question 2

Kharif crops

Rabi crops

Rainy crops

Weeds

Solution

Question 3

Harvesting

Tilling

Winnowing

Irrigation

Solution

Question 4

Damaged seeds do not flow on water

Damaged seeds are shiny

Damaged seeds are not shiny

Damaged seeds float on water

Solution

Question 5

To protect crops from insects and weeds.

To provide seeds with a good amount of water.

To provide proper nutrients to crops for growth.

To help crops in photosynthesis.

Solution

Question 6

Pasteurization

Chemicals

Preservation

None of the above

Solution

Question 7

Protein

Vitamins

Minerals

Chlorophyll

Solution

Question 8

Yeast reproduces rapidly

Yeast produces carbon dioxide during respiration.

both A and B

None of the above

Solution

Question 9

50°C

60°C

70°C

80°C

Solution

Question 10

Streptomycin

tetracycline

erythromycin

All of the above

Solution

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