Biology [NSTSE (National Science Talent Search Exam- Unified Council) Class 9]: Questions 413 - 418 of 518

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Question 413

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Question

MCQ▾

Soil erosion is

Choices

Choice (4)Response

a.

Removal of top layers of soil by water

b.

Removal of top layers of soil by wind

c.

Removal of top layers of soil by ranching and grazing

d.

All a. , b. and c. are correct

Question 414

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Question

MCQ▾

Which of the following provides protection to life?

Choices

Choice (4)Response

a.

Ozone layer

b.

Nitrogen

c.

Hydrogen

d.

Carbon-di-oxide

Question 415

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Question

MCQ▾

Nitrifying bacteria are those

Choices

Choice (4)Response

a.

Which converts atmospheric nitrogen into nitrites and nitrates

b.

Only the means of nitrification

c.

Have symbiotic relationship with leguminous plants

d.

Both a. and c. are correct

Question 416

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Question

MCQ▾

Chipko movement is associated with

Choices

Choice (4)Response

a.

Soil conservation

b.

Forest conservation

c.

Wetland conservation

d.

Water conservation

Question 417

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Question

MCQ▾

Denitrification is

Choices

Choice (4)Response

a.

nitrogen fixation

b.

removal of nitrogenous waste material

c.

conversion of atmospheric nitrogen into nitrates

d.

conversion of nitrates into nitrogen

Question 418

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Question

MCQ▾

Layer of earth that contains life is known as

Choices

Choice (4)Response

a.

Mantle

b.

Crust

c.

Outer core

d.

Inner core