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Human Health and Disease — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
For two statements are given$-$one labelled Assertion and the other labelled Reason. Select the correct answer to these questions from the codes $(a), (b), (c)$ and $(d)$ as given below.
Assertion : Passive immunity is of short life span.
Reason: Passive immunization is promptly available.
  • A
    Both assertion and reason are true, and reason is the correct explanation of assertion.
  • ✓
    Both assertion and reason are true, but reason is not the correct explanation of assertion.
  • C
    Assertion is true, but reason is false.
  • D
    Both assertion and reason are false.
✓

Answer

Correct option: B.
Both assertion and reason are true, but reason is not the correct explanation of assertion.
Passive immunity is resistance based on antibodies preformed in another host. Administration of antibody against diphtheria, tetanus, botulism, etc. makes large amounts of antitoxin immediately available to neutralize the toxins. Likewise, preformed antibodies to certain viruses can be injected during the incubation period to limit viral multiplication. The main advantage of passive immunity is the prompt availability of large amounts of antibody $($as it is formed from another host$),$ disadvantages are the short life span of these antibodies and possible hypersensitivity reactions of globulin from another species are used.

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