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Active immunity differs from passive immunity in that:
AThey are identical
BActive = host produces antibodies in response to antigen (slow but lasting); passive = ready-made antibodies given directly (rapid but transient, e.g., colostrum, antitoxin in snakebite/tetanus)
CActive is only for bacteria; passive only for viruses
DActive immunity is given by injection; passive is natural
Answer & Solution
Correct answer: B. Active = host produces antibodies in response to antigen (slow but lasting); passive = ready-made antibodies given directly (rapid but transient, e.g., colostrum, antitoxin in snakebite/tetanus)
**Active immunity** = host produces own antibodies (slow onset, long-lasting memory). E.g., vaccination, infection. **Passive immunity** = ready-made antibodies (fast onset, no memory). E.g., **mother's colostrum (IgA) to infant**, **antitoxin** for tetanus/snakebite, IgG across placenta.
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