AIIMS2018Zoology-Biology
AIIMS 2018 Zoology Biology MCQ Question
Type: MCQ-conceptual-Medium-Class 11
Assertion : Deficiency of vitamin D causes bone weakness
Reason : Cholecalciferol is synthesised in skin by the action of sunlight
A
Both A and R are true and R is the correct explanation of A.
B
Both A and R are true but R is not correct explanation of A
C
A is true but R is false
D
A and R are false
Correct Answer
Option B
Detailed Explanation
The assertion is true because a kidney transplant from a non-matching donor is often rejected due to the immune system recognizing the foreign tissue as a threat. However, the reason is incorrect; rejection is primarily mediated by T-lymphocytes (not B-lymphocytes), which are responsible for cell-mediated immunity. Therefore, while both the assertion and reason are true, the reason does not correctly explain the assertion.
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