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Q:

The Vitamin required for the synthesis of nucleic acid is

A) Tocoferorl B) Folic acid
C) Cyanocobalamine D) Riboflavin
 
Answer & Explanation Answer: B) Folic acid

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21 5267
Q:

Dicotyledonous weeds are destroyed by a chemical called

A) Indole - acetic acid B) 2- 4 dichlorophenoxy acetic acid
C) Abscisic acid D) Naphthalene acetic acid
 
Answer & Explanation Answer: B) 2- 4 dichlorophenoxy acetic acid

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44 5204
Q:

In plants, exchange of gases takes place through

A) Stomata B) Palisade tissue
C) Spongy tissue D) mid rib
 
Answer & Explanation Answer: A) Stomata

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21 5183
Q:

Monocarpic plants are those that produce fruits ...............during the life of the plant

A) once B) thrice
C) many times D) twice
 
Answer & Explanation Answer: A) once

Explanation:

Plants are of different types. Some grow well and then produce fruits before they die. In other words they fruit only once in their life. Such plants are said to be monocarpic. Other plants produce fruits every season. These are called polycarpic plants.

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30 5162
Q:

In diseases like Polio, the cells that get destroyed by virus, are

A) Monocytes B) Erythrocytes
C) Motor neurons D) Sensory neurons
 
Answer & Explanation Answer: C) Motor neurons

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14 5142
Q:

Lathyrism is caused by excess consumption of.......

A) Khesari Dal B) Mustard oil
C) Mushrooms D) Polished rice
 
Answer & Explanation Answer: A) Khesari Dal

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15 4969
Q:

Branch of agriculture concerned with the production of crops

A) Agrotology B) Agronomy
C) Agrostology D) Anthropology
 
Answer & Explanation Answer: B) Agronomy

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20 4905
Q:

Damage to hearing is caused by sounds which exceed

A) 70 decibels B) 80 decibels
C) 100 decibels D) 120 decibels
 
Answer & Explanation Answer: D) 120 decibels

Explanation:

High frequency sound attacks the tympanic memberance and makes it defective. 120 decibels is too high a pitch to be heard and therefore it impairs the hearing ability.

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21 4866