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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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Filed Under: Biology

Q:

In case of a heart attack, a hormone is injected as an emergency measure, Which one is it?

A) Thyroxine	B) Adrenaline
C) Heparin	D) Insulin

Answer & Explanation Answer: B) Adrenaline

Explanation:

Heparin is a hormone secreted by the liver. This is anticoagulant in its property. It prevents cloting of blood inside the heart and blood vessels. Heart attack is the result of a block in the blood vessels supplying blood to the walls of the heart.

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Q:

The rate of heartbeat is accelerated by the harmone

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 harmone. In emotional upset (like fear, anger etc.) this harmone is poured into the blood and it accelerates heart beat. The hormone acetylcholine decelerates heartbeat rate.

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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 to be converted into thrombin in the presence of $C a^{+ +}$ ion.

Thrombin combines with fibrinogen to produce fibrin threads which entangles the corpuscles to form the clot.

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Filed Under: Biology
Exam Prep: AIEEE , GATE

Q:

Organisms that depend only on raw plant products are said to be

A) herbivorous	B) vegetarian
C) carnivorous	D) omnivorous

Answer & Explanation Answer: A) herbivorous

Explanation:

Herbivorous organisms are those that take for their food, plant parts like leaves raw in contrast to vegetarian, which means that plant products are taken raw or after being cooked.

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Q:

Organisms that feed on the excreta of other organisms are called

A) autotrophs	B) heterotrophs
C) coprophagous	D) saprotrophs

Answer & Explanation Answer: C) coprophagous

Explanation:

The word coprodaeum refers to the last part of the elimentary canal.The excreta (undigested, matter) comes out of that part. So, the organisms that take in such materials are called coprophagous.

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Q:

The Mode of nutrition in which particulate food is devoured is

A) holozoic	B) holophytic
C) saprophytic	D) Parasitic

Answer & Explanation Answer: A) holozoic

Explanation:

The feeding mechanism is of several types. If it is entirely plant-like (photosynthesis),it is called holophytic. It is entirely (holo) animal-like (zoic), that is devouring already existing food, it is called holozoic.

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Q:

The protoplasm of a child is exactly the same as that of its

A) mother	B) father
C) grandfather	D) identical twin

Answer & Explanation Answer: D) identical twin

Explanation:

Though all living organisms are made of protoplasm each individual has a different composition however slight it be. In identical twins the same cell divides into two and each one develops into one person. So the genitic make-up and type of protoplasm are exactly the same.

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