The hereditary disease in which clotting of blood does not take place is known as
A
Haemophilia
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B
Anaemia
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C
Leukaemia
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D
Xerophthalmia
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Solution
The correct option is A Haemophilia
A. Hamophilia is a sex linked recessive disease in which a single protein that is a part of the cascade of proteins involved in the clotting of blood is affected and blood doesn't clot properly. This leads to excessive bleeding.
B. Anaemia is a disease in which there is deficiency of red blood cells or haemoglobin in the blood, resulting in pallor.
C. Leukaemia is a cancer of the body's blood forming tissues including the bone marrow and lymphatic system. It generally involves white blood cells.
D. Xerophthalmia is a eye disease in which there is dryness of the conjunctiva and cornea of the eye caused by vitamin A deficiency.