Improvement in Food Resources-Food Resources [CBSE (Central Board of Secondary Education) Class-9 Science]: Questions 1 - 5 of 23

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Question 1

Question MCQ▾

Hybridization produces:

Choices

Choice (4)Response

a.

Vigorous and better adapted varieties which brings superior characters

b.

Creation of new genotype, HYV plant dwarf in height

c.

Responsive to fertilizers and takes less time for ripening

d.

All a., b. and c. are correct

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Question 2

Question MCQ▾

Why need arise to varietal/crop improvement?

Choices

Choice (4)Response

a.

Increased yield and improved quality

b.

To produce varieties resistant to biotic and abiotic stresses, early and uniform maturity

c.

Desirable agronomic characters

d.

All a., b. and c. are correct

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Question 3

Question MCQ▾

Preventive measures against crop pests are:

Choices

Choice (4)Response

a.

Optimum time of cropping

AND

Crop rotation, multiple cropping, clean cultivation

b.

Use of pest and disease resistant hybrid

c.

Summer ploughing

d.

All a., b. and c. are correct

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Question 4

Question MCQ▾

The plants live at the expense of main crop are called as:

Choices

Choice (4)Response

a.

Unwanted plants

b.

Weeds

c.

Pests

d.

All a., b. and c. are correct

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Question 5

Question MCQ▾

Weeds are harmful to the plants:

Choices

Choice (4)Response

a.

Spreading insect pests, produces the toxic substance which may interfere in crops growth

b.

Because they decrease the crop yield, compete with main crop for the nutrients, water as well as sunlight

c.

May produce the weed poison

d.

All a., b. and c. are correct

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