AIIMS 2018 Zoology Biology MCQ Question
Assertion : During pregnancy, development of foetus occurs in stages.
Reason : In second month of pregnancy, limbs, most of the organs and external genitalia are formed.
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not correct explanation of A
A is true but R is false
A and R are false
Correct Answer
Detailed Explanation
The assertion is true because kidney transplants from non-matching donors are often rejected by the recipient's immune system due to the presence of foreign antigens. However, the reason provided is incorrect; while B-lymphocytes are involved in the immune response, the primary mechanism of rejection in this context is mediated by T-lymphocytes (cell-mediated immunity), not B-lymphocytes, which are primarily responsible for antibody production. Therefore, both statements are true, but the reason does not correctly explain the assertion.
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