Botany : Biology MCQ Practice Questions & Answers (Hindi) - Page 3

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41.

Which Pollutant causes leaf curling

A

$H_2S$

B

$O_3$

C

$SO_2$

D

CO

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42.

Which one of the following is normally not an atmospheric pollutant ?

A

$CO_2$

B

$SO_2$

C

Hydrocarbon.

D

CO

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43.

Which one of the following is natural insecticide

A

Pyrethrum

B

Nicotine

C

both a and b

D

None of these

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44.

Which one is the major component of Bordeaux mixture

A

Copper sulphate

B

Sodium chloride

C

Calcium chloride

D

Magnesium sulphate

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45.

Which one is green manure

A

Sesbania

B

Rice

C

Oat

D

Maize

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46.

Which is not applicable to vegetatively propagated plants

A

To get true to type plants

B

To protect an elite quality

C

To conserve a plant

D

To get a new type of plant

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47.

Which is not a green house gas?

A

CFC

B

$CH_4$

C

CO

D

$H_2$

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48.

What is the area in floriculture (in 1000 hectare) in India

A

40 - 50

B

60 - 80

C

100 - 120

D

None of these

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49.

Water logging of soil makes it physiologically dry because

A

This condition does not allow the capillary force to work

B

this condition does not allow oxygen to enter the soil

C

both a and b

D

none of these

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50.

Water blooms are formed by

A

Lemna

B

Hydrilla

C

Water hyacinth

D

Planktonic algae.

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51.

Urea is a source of

A

Phosphorous

B

Nitrogen

C

Potassium

D

All of the above

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52.

Tissue culture is a good technique to

A

Cross two varieties

B

Rapidly increase the size of a trees by strengthening the stem

C

Eliminate virus

D

Improve yield of crops

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53.

Thermal pollution is more common near

A

Hot water springs

B

Coal based power plants

C

Tropical regions

D

Temperate regions.

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54.

The worst enemy of ozone is

A

Liquid $NH_3$

B

$SO_2$

C

$CH_4$

D

CO.

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55.

The word Agriculture is derived from

A

Greek

B

Latin

C

Arabic

D

French

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56.

The process by which nutrient chemicals or contaminants are dissolved and carried away by water, or are moved into a lower layer of soil

A

Mulching

B

Desertification

C

Incineration

D

Leaching

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57.

The pH in soils can be raised by adding:

A

Sand

B

lime

C

sulphur

D

nitrogen

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58.

The newspaper contains one of the following toxic material

A

Mg

B

Cd

C

Pb

D

Hg.

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59.

The main function of NABARD is

A

Farmers loaning

B

Agricultural research

C

Refinancing to agricultural financing institutions

D

Development of agriculture

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60.

The main atmospheric layer near the surface of earth is

A

Troposphere

B

Mesosphere

C

Ionosphere

D

Stratosphere

Botany in Biology : Practice MCQ Questions & Answers with Explanations