Question

Assertion (A) : Mucosa-associated lymphoid tissues are specialised immune barriers located on the skin.

Reason (R) : MALT constitutes about 50 percent of the lymphoid tissue in a human body.

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

Hint:

MALT lines the respiratory, digestive and urogenital tracts, not the skin. It forms about 50 percent of lymphoid tissue.

Answer 1

The Correct Option is D

Step 1: Check the Assertion:
MALT is lymphoid tissue located within the lining of the major tracts, that is the respiratory, digestive and urogenital tracts.
It is not on the skin. So Assertion (A) is false.

Step 2: Check the Reason:
NCERT states that MALT constitutes about 50 percent of the lymphoid tissue in the human body. So Reason (R) is true.

Step 3: Pick the code:
A is false and R is true. This is option (D).

Final Answer:
The Assertion is false and the Reason is true, so the answer is option (D).