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Which statement about active and passive immunity is correct?
AActive acts at once, passive is slow to develop
BBoth act at once but neither gives memory
CBoth are slow and both give lasting memory
DActive is slow to develop, passive acts at once
Answer & Solution
Correct answer: D. Active is slow to develop, passive acts at once
1. Active immunity follows the host producing its own antibodies after exposure.
2. That process is slow and takes time to give its full effective response.
3. Passive immunity supplies ready made antibodies, so protection is available immediately.
4. The trade off is duration: passive protection fades because no memory is created.
5. Reversing the two is the classic exam trap in this section.
_Source: NCERT Class 12 Biology Ch7 'Human Health and Disease', section 7.2.3_
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