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Q:

The grouping of blood is based on substances called 

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

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.

Subject: Biology
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

Explanation:
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Q:

Number of eyes found in Earthworm..........

A) One B) Many
C) No eye D) Two
 
Answer & Explanation Answer: C) No eye

Explanation:
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Q:

The universal donor belongs to blood group

A) A B) B
C) AB D) O
 
Answer & Explanation Answer: D) O

Explanation:

The persons with 'O' blood group do not have antigens in the red corpuscles. So that blood will not cause agglutination of corpuscles if mixed with any type of blood. So group 'O' persons are called universal donors.

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Q:

Man has...............pairs of salivary glands

A) 4 B) 6
C) 3 D) 8
 
Answer & Explanation Answer: C) 3

Explanation:

Salivary glands of man are 3 pairs = 6. They are one pair of parotid glands, one pair of submaxillary or submandibular glands and one pair of sublingual glands.

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Q:

The brain is covered by

A) meninges B) skin
C) bone D) all the above
 
Answer & Explanation Answer: D) all the above

Explanation:

The central nervous system ( brain and spinal card ) are invested with the meninges which nourish and protect the system .This again is enclosed inside a bony box which has the skin above it

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