Botany : Biology MCQ Practice Questions & Answers (Hindi) - Page 4

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61.

The instrument, which is used for sowing of seed with fertilizer together at a time, is

A

Seed drill

B

Dibbler

C

Seed sowing behind plough

D

Ferti-cum Seed drill

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62.

The following is not a plant growth regulator

A

Acetic acid

B

Auxins

C

Gibberellins

D

Ethylene

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63.

The desired varieties of economically useful crops are raised by

A

Vernalization

B

Mutation

C

Natural selection

D

hybridisation

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64.

Spraying of DDT produces pollution of

A

Air

B

Air and Water

C

Air and Soil

D

Air, Water and Soil.

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65.

Spot the odd one

A

Borders

B

Hedges

C

Edges

D

Bonsai

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66.

Sound becomes hazardous noise pollution at level

A

Above 30 dB

B

Above 80 dB

C

Above 100 dB

D

Above 120 dB.

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67.

$SO_2$ pollution causes

A

Plasmolysis

B

Destruction of cell wall

C

Destruction of Golgi bodies

D

Destruction of chlorophyll.

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68.

$SO_2$ and $NO_2$ Produce pollution by increasing

A

Alkalinity

B

Acidity

C

Neutrality

D

Buffer action.

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69.

Seed treatment with Vitavex is the main controlling method of

A

Loose smut

B

Rust

C

Downy mildew

D

All of these

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70.

Seed treatment is done to control

A

Soil-borne disease

B

Air-borne disease

C

Seed-borne disease

D

None of these

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71.

Roses can grow successfully if stock and scion are

A

Of related species

B

Of different species

C

Of different groups

D

Of similar class

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72.

Rootex contains

A

ABA

B

Kinetin

C

Ethylene

D

Auxins

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73.

Root suckers are

A

Shoots that arise from roots to form new plant

B

New plant parts that arise from the branches of fruit trees

C

Roots of neighboring plants that share water with the another plant

D

Insects that suck nutrients from the roots of plants

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74.

Role of CFC present in atmosphere is to

A

Ozone formation

B

Formation of leg haemoglobin

C

Enhance chlorophyll formation.

D

Reduction in ozone

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75.

Pudding is done to

A

Pulverise and levelling soil

B

Kill weeds

C

All of the above

D

Reduce percolation of water

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76.

Pollutants released from paddy field is

A

CO

B

$H_2O_2$

C

$CH_4$ .

D

$CO_2$

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77.

Pesticide responsible for Ozone depletion is

A

DDT

B

Melathion

C

None of the above.

D

BHC

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78.

Ozone layer is found in

A

Stratosphere

B

Mesosphere

C

Lithosphere.

D

Thermosphere

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79.

Ozone hole is caused by

A

Ethylene

B

Chlorofluorocarbons

C

Methane.

D

Acetylene

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80.

Ozone hole causes

A

Reduction in the rate of photosynthesis

B

More UV rays come to earth

C

All the above.

D

Global warming

Botany in Biology : Practice MCQ Questions & Answers with Explanations