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Human Health and Disease — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
Certain infectious diseases do not occur for a second time because:
  • ✓
    Our immune system keeps a memory of the previous exposure.
  • B
    After that we are given nutritious food.
  • C
    We are not allowed to contact people suffering from it.
  • D
    None of the above.
✓

Answer

Correct option: A.
Our immune system keeps a memory of the previous exposure.

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