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ICSE Class 9 Biology Question 3 of 11

Diseases: Cause and Control — Question 2

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Question 2

What are the causes and symptoms of malaria, chicken pox and tuberculosis? How can these diseases be prevented?

Answer

The causes, symptoms and preventive measures of these diseases are as given below:

  1. Malaria
    • Causes — Protozoan, Plasmodium.
    • Symptoms — Chills, high fever, profuse sweating, severe headache, nausea, vomiting, fatigue and body pain.
    • Preventive measures — Avoid mosquito bites using mosquito repellents and nets avoid being around stagnant water.
  2. Chicken Pox
    • Causes — Virus, Varicella zoster.
    • Symptoms — Rashes near the back and the chest eventually spreading to arms, face, legs and head.
    • Preventive measures — Active immunisation by administering live attenuated vaccine containing Varicella.
  3. Tuberculosis
    • Causes — Mycobacterium tuberculosis.
    • Symptoms — Persistent cough, afternoon fever, bloody mucus, loss of weight, fatigue and chest pain.
    • Preventive measures — BCG vaccination and isolation of the patient.