Biology Questions

Q:

The enzyme that is necessary to bring about clotting of blood is 

A) peptidase B) amylase
C) lipase D) thrombokinase
 
Answer & Explanation Answer: D) thrombokinase

Explanation:

The clotting of blood is a chain reaction initiated by the enzyme Thrombokinase produced by the platelets. This causes Prothrombin and calcium salts in plasma to join and produce thrombin. Thrombin combines with Fibrinogen to produce Fibrin threads which entangles the corpuscles  to create a clot.

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18 5646
Q:

Silviculture is the branch of botany in which we study about

A) Culture of algae B) Development of forest
C) Culture of fungi D) Silciphida plant
 
Answer & Explanation Answer: B) Development of forest

Explanation:
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32 5606
Q:

During rainy season wooden doors are difficult to open or closure because of  ?

A) Imbibition B) Plasmolysis
C) Diffusion D) Osmosis
 
Answer & Explanation Answer: A) Imbibition

Explanation:
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28 5527
Q:

The rate of heartbeat is accelerated by the hormone 

A) adrenaline B) acetylcholine
C) thyroxine D) pituitrin
 
Answer & Explanation Answer: A) adrenaline

Explanation:

The hormone adrenaline also called epinephrine is known as a stress hormone. In emotional upsets( like fear, anger etc.) this hormone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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37 5491
Q:

Which one of the following vitamins is known as the anti sterile factor  ?

A) Ascorbic acid B) Riboflavin
C) Niacin D) Retinol
 
Answer & Explanation Answer: B) Riboflavin

Explanation:
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35 5018
Q:

Only male frog produce croacking sound because ____

A) Female frog have no larynx B) Female frog have larynx but no vocal cord
C) Male frog have three pair of vocal cord D) Male frog can magnify their voice with the help of sound box
 
Answer & Explanation Answer: A) Female frog have no larynx

Explanation:
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22 4954
Q:

The leaves used as wrappers for bides are obtained from which one of the following ?

A) Shikakai B) Rudraksha
C) Tendu D) Lemon grass
 
Answer & Explanation Answer: C) Tendu

Explanation:
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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

Explanation:
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42 4933