NEETZoologyBody Fluids and Circulation
Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): An Rh ^ - ve mother usually does not suffer complications due to Rh incompatibility during her first pregnancy with an Rh ^ + ve foetus. Reason (R): The foetal and maternal blood are normally kept well separated by the placental barrier during pregnancy. In the light of the above statements, choose
Options
- ABoth (A) and (R) are correct but (R) is not the correct explanation of (A)
- BBoth (A) and (R) are correct and (R) is the correct explanation of (A)
- C(A) is correct but (R) is not correct
- D(A) is not correct but (R) is correct
Correct answer
B. Both (A) and (R) are correct and (R) is the correct explanation of (A)
Step-by-step solution
Assertion (A) is correct because during the first pregnancy, the Rh ^ - ve mother is usually not exposed to the Rh ^ + ve antigens of the foetus. Reason (R) is correct and correctly explains the assertion. The foetal and maternal blood are normally kept well separated by the placenta, preventing the mother's immune system from encountering the foetal Rh antigens and producing anti-Rh antibodies until the time of birth when the placenta detaches. Therefore, both (A) and (R) are correct and (R) is the correct explana