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ICSE Class 9 Biology Question 2 of 11

Diseases: Cause and Control — Question 1

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Question

Question 1

Write very briefly about the following:

(a) BCG

(b) Incubation period

(c) Chicken pox

(d) Hepatitis A

Answer

(a) BCG — BCG (Bacillus Calmette Guerin) is a vaccine which is effective against the bacterial disease tuberculosis(TB). It develops immunity to tuberculosis.

(b) Incubation period — Incubation period is the period between the entry of germs and appearance of the first symptoms of the disease. All infectious diseases have a certain incubation period.

(c) Chicken pox — The disease is a contagious disease occurring mainly in children, and is caused by Herpes Varicella zoster virus. The disease rapidly spreads through close contact with the person infected.

(d) Hepatitis A — It is caused by the Hepatitis A virus and is a viral disease that results in liver inflammation. It is transferred primarily through contaminated water and food.