Question

State the three characteristics of aquired immunity. List the different ways by which it can be attained by humans?


class 12th CBSE Biology sample paper

Answer 1

The Characteristics of acquired immunity are:

1)It is pathogen specific

2)it is characterised by memory.

3)Response can be characterised as a primary response (of low intensity) and secondary response.

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Acquired immunity can be attained by humans in the following ways:

1)Active immunity The antibodies are produced in the host body as a response to foreign entities, i.e, on living microbes or other proteins.

the onset of response is slow.

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2)Passive immunity The readymade antibodies are directly introduced to protect the body against foreign agents.