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Human Health and Disease

Long Answer Type

91. Name the pathogen that causes amoebiasis in human. Give the symptoms and modes of transmission.

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Short Answer Type

92.

Answer the following questions:
(i) How and at what stage does Plasmodium enter into a human body?
(ii) Why does the victim show symptoms of high fever?

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Long Answer Type

93. Name the type of immunity that is present at the time of birth in humans. Explain any two ways by which it is accomplished.

Innate immunity. It is also called inborn or non-specific immunity. It is the first line of defence. It is composed of following steps :

1. Physical barriers. The skin and mucous membranes constitute the physical barrier of immunity. The mucous entraps the microbes and protects the body. The oil and sweat does not let any microbe grow on the skin.

2. Physiological barrier. Body temperature, pH and various body secretions like tears prevent growth of many pathogenic micro-organisms.

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