Question

Sera are used to provide _______

• A. Passive immunity
• B. Active immunity
• C. Long-term protection
• D. No immunity

Hint:

Sera provide ready-made antibodies, so they produce passive immunity.

Answer 1

The Correct Option is A

Concept:
Sera contain ready-made antibodies. These antibodies are introduced into the body to provide immediate protection.

Step 1: Understanding immunity.
Immunity may be active or passive. Active immunity develops when the body produces its own antibodies. Passive immunity is produced when ready-made antibodies are given.

Step 2: Role of sera.
Sera do not stimulate the body to make antibodies. Instead, they directly provide antibodies.

Step 3: Nature of protection.
Passive immunity acts quickly, but it is usually temporary because the antibodies are gradually destroyed.

Step 4: Final answer.
Therefore, sera are used to provide passive immunity. \[ \boxed{\text{Passive immunity}} \]