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Human Health and Disease — BIOLOGY STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 ScienceBIOLOGYHuman Health and Disease1 Mark
MCQ
The term active immunity means :
  • ✓
    Resistance developed after disease.
  • B
    Resistance developed before disease.
  • C
    Resistance rate of heart beat.
  • D
    Increasing quantity of blood.
✓

Answer

Correct option: A.
Resistance developed after disease.
Active immunity occurs when the person is exposed to a live pathogen, develops the disease and becomes immune as a result of the primary immune response.
When $B$ cells and $T$ cells are activated by a pathogen, memory $B-$ cells, and $T-$ cells develop, and the primary immune response results.
Throughout the lifetime of an animal, these memory cells will “remember” each specific pathogen encountered, and are able to mount a strong secondary response if the pathogen is detected again.

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