Botany : Biology MCQ Practice Questions & Answers (Tamil)

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1.

Which gas of the atmosphere holds up ultraviolet rays ?

A

$O_3$

B

$O_2$

C

$N_2$

D

$CO_2$

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2.

For successful grafting, stock and scion shall be

A

Of different species

B

Of same species

C

Of similar groups

D

Of different class

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3.

External agencies are not required in

A

natural vegetative propagation

B

sexual reproduction

C

bisexual reproduction

D

trisexual reproduction

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4.

Examples of Corm include

A

Gloriosa

B

Canna

C

Lallang

D

Ginger

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5.

Example of plant in which vegetative propagation is occurred by leaves is called

A

Cannabisn

B

Chrysanthemum

C

Cryophyllum

D

Brassica

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6.

Example of natural vegetative propagation does not include

A

Corals

B

bulbs

C

corms

D

rhizomes

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7.

Eutrophication results in reduction of

A

Dissolved nitrate

B

Dissolved Oxygen

C

Mineral salts

D

Parasitic protozoa.

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8.

Disadvantages of natural vegetative propagation includes

A

lack of dispersal mechanisms

B

no fertilization is involved

C

area is quickly colonized

D

daughter plants can grow quickly

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9.

Cutting is not suitable for

A

Lime

B

Sugar-cane

C

Oleander

D

Tapioca

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10.

Cryopreservation is a technique used for

A

Crystallization of food

B

Food packing

C

Seed saving

D

Preservation of excess production of vegetables

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11.

Considering corms of natural vegetative propagation, buds are present at

A

Front side of corm

B

Backside of corm

C

Top of corm

D

End of corm

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12.

Composted manure is produced from

A

Farmyard manure and green manure

B

Farm refuse and household refuse

C

Organic remains of biogas plants

D

Rotten vegetables and animal refuse

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13.

Component of smog

A

PPN & PAN

B

Both a and b

C

$O_3$

D

PAN

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14.

Coacervates were formed by

A

Polymerization

B

Polymerisation and aggregation

C

DNA

D

Radiations

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15.

Coacervates were experimentally produced by

A

Aristotle

B

Louis Pasture

C

Oparin and Haldane

D

Darwin

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16.

Classical taxonomy is also termed

A

Descriptive taxonomy

B

Experimental taxonomy

C

Beta taxonomy

D

Systematic

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17.

Chief air pollutant which is likely to deplete ozone layer is

A

Carbon monoxide

B

Nitrogen oxides and Fluorocarbons.

C

Sulphur dioxide

D

Carbon dioxide

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18.

Carbon monoxide kills because it destroys

A

Cytochrome

B

Both a and b.

C

Haemoglobin

D

Phytochrome

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19.

Carbon monoxide is pollutant as it

A

Combines with oxygen

B

Combines with haemoglobin.

C

Inactivates nerves

D

Inhibits glycolysis

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20.

Cadmium damages

A

Stomach

B

Liver and Kidneys.

C

Heart

D

Lungs

Botany in Biology : Practice MCQ Questions & Answers with Explanations

Botany in Biology : Practice MCQ Questions & Answers with Explanations