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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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Filed Under: Biology

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 Ca++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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Filed Under: Biology

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

Q:

Organisms which synthesise their own food are called

A) autotrophs B) heterotrophs
C) auxotrophs D) saprotrophs
 
Answer & Explanation Answer: A) autotrophs

Explanation:

Autotroph: This term means organisms that synthesise their own food. Troph means feeding. Auto means self. The green plants which synthesise their own food are called autotrophs. All others which depend upon the plants directly or indirectly are called heterotrophs.

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Filed Under: Biology

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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Filed Under: Biology