When antibodies produced in one body are transferred to another to induce protection against a disease, it is known as :

When antibodies produced in one body are transferred to another to induce protection against a disease, it is known as –

[a] Passive immunity
[b] Herd Immunity
[c] Active immunity
[d] Humoral immunity

✅ Correct Answer:
[a] Passive immunity

Explanation:

Passive Immunity
🔺Occurs when ready-made antibodies are directly transferred from one individual to another.
🔺The recipient's body does not produce the antibodies itself.
🔺Protection is immediate but temporary.
Example:
🔺Transfer of maternal antibodies to a baby through breast milk.
🔺Anti-venom given after a snakebite.
🔺Immunoglobulin injections for diseases like hepatitis.

Why others are incorrect:

[b] Herd Immunity:
🔺Occurs when a large portion of a population becomes immune, reducing the spread of disease.

[c] Active Immunity:
🔺Happens when the body actively produces its own antibodies after infection or vaccination.
🔺Example: getting a flu shot or recovering from COVID-19.

[d] Humoral Immunity:
🔺A type of active immunity involving B cells and antibody production in body fluids (humors), not direct transfer from another person.