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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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Filed Under: Biology

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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Filed Under: Biology

Q:

The grouping of blood is based on substances called

A) antibodies	B) antigens
C) antitoxin	D) enzymes

Answer & Explanation Answer: B) antigens

Explanation:

The red blood corpuscles or erythrocytes usually carry antigens and there are two types of antigens. The A group persons have antigen A in their red corpuscles and the B group have antigen B in their red corpuscles. The AB group person have both antigen A and antigen B in their erythrocytes. The 'O' group persons have no antigens in their red corpuscles.

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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:

The insects do not have blood pigments because

A) there is no blood	B) tissues have pigments
C) blood does not have a respiratory function	D) pigments are elsewhere

Answer & Explanation Answer: C) blood does not have a respiratory function

Explanation:

The blood of some invertebrate animals like the earthworm is red due to haemoglobin pigment, but the pigment is dissolved in the plasma. In vertebrates the same pigment is found in the red corpuscles and not in the plasma.

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Filed Under: Biology

Q:

Infection of salivary glands by a virus leads to

A) tetanus	B) mumps
C) pyorrhoea	D) ulcers

Answer & Explanation Answer: B) mumps

Explanation:

Mumps: This is a swelling caused by inflammation of parotid glands placed in front of our ear region. The Inflammation is caused by a virus.

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Q:

Man has _____ pairs of salivary glands

A) 3	B) 4
C) 6	D) 8

Answer & Explanation Answer: A) 3

Explanation:

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of sub-maxillary or sub-mandibular glands and one pair of sub-lingual glands.

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Filed Under: Biology

Q:

Enzymes are produced by

A) endocrine glands	B) exocrine glands
C) liver	D) spleen

Answer & Explanation Answer: B) exocrine glands

Explanation:

Glands are of two types. The exocrine glands have ducts to carry their secretions and these secretions contain enzymes. on the other hand, endocrine glands are ductless glands and they secrete mainly horomones.

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Filed Under: Biology

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