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Ecology & Environment Our Environment
Q.

2. Consider the following statements: 

1. Typhoid fever in human beings is caused by a virus. 

2. Plasmodium is a tiny protozoan responsible for causing malaria.

3. Plasmodium enters the human body through the bite of infected female Anopheles mosquito.

Which of the statements given above is/are correct?
Explanation:

ANSWER: (B) 

Typhoid

  • Typhoid fever in human beings is caused by a bacterium. (Thus, Statement 1 is not correct)
  • These pathogens (disease causing organisms) generally enter the small intestine through food and water contaminated with them and migrate to other organs through blood.
  • Bacteria are responsible for the disease pneumonia in humans which infects the alveoli (air filled sacs) of the lungs.
  • Dysentery, plague, diphtheria, etc., are some of the other bacterial diseases in man.

Malaria

  • Plasmodium, a tiny protozoan is responsible for causing malaria. Plasmodium enters the human body as sporozoites (infectious form) through the bite of infected female Anopheles mosquito. (Thus, Statement 2 is correct.

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