CBSE (Central Board of Secondary Education) Class-8 Science: Questions 23 - 28 of 465

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Question 23

Question MCQ▾

Fixation of Nitrogen is:

Choices

Choice (4)Response

a.

The process of conversion of free nitrogen into compounds of nitrogen.

b.

Release of ammonia after death or decay of plant bodies.

c.

Free nitrogen present in the atmosphere.

d.

Conversion of nitrogen into amino acids and proteins by the plants

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Question 24

Question MCQ▾

Bacterial diseases in plants are:

Choices

Choice (4)Response

a.

loose smut of wheat, potato blight

b.

Leaf spot of cotton

c.

Citrus canker , potato scab

d.

Both b. and c. are correct

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Question 25

Question MCQ▾

What is Boadcasting

Choices

Choice (4)Response

a.

Process of breaking up of the soil

b.

process of sowing seeds by hand

c.

Process of loosening and turning of soil

d.

Process of removing weeds

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Question 26

Question MCQ▾

Method of storing and packing of food is

Choices

Choice (4)Response

a.

Canning

b.

Irradiation

c.

UHT

d.

Drying

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Question 27

Question MCQ▾

Name the festival related to harvesting season in Tamil Nadu

Choices

Choice (4)Response

a.

Pongal

b.

Baisakhi

c.

Bihu

d.

Onam

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Question 28

Question MCQ▾

What is lodging?

Choices

Choice (4)Response

a.

Fast and strong winds accompanied by rains result in fall of mature crops

b.

Scarcity of water for the crops

c.

Increase in the amount of salts in the soil

d.

Excessive supply of water to the crop

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