Question

Assertion (A) : Innate immunity is a non-specific type of defence.
Reason (R) : Skin in our body is the main physical barrier which prevents entry of microorganisms.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Both statements are true, but the skin barrier does not explain why innate immunity is non-specific.

Answer 1

The Correct Option is B

Step 1: Check the Assertion:
Innate immunity is present at birth. It acts the same way against all pathogens, so it is non-specific. So (A) is true.

Step 2: Check the Reason:
The skin is the main physical barrier. It keeps microorganisms from entering the body. So (R) is true.

Step 3: Does R explain A:
Innate immunity is non-specific because its barriers, cells and chemicals do not target one particular antigen. The skin is only one example of a barrier. It does not give the reason for non-specificity.

Step 4: Select the code:
Both are true but R is not the correct explanation. So option (B).

Final Answer:
The correct option is (B).