Q168 / 180 · NEET 2026 (Cancelled) · Zoology
Select the incorrect statements with reference to Rh grouping :
A. Erythroblastosis foetalis is a condition observed having foetus with Rh$^{-ve}$ blood and mother with Rh$^{+ve}$ blood.
B. Rh antigen is observed on RBCs in the majority of human beings.
C. Before blood transfusion, Rh group should also be matched.
D. Rh incompatibility is observed when a pregnant mother is Rh$^{-ve}$ and the foetus is Rh$^{+ve}$.
E. Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the second child.
Choose the answer from the options given below :
A. Erythroblastosis foetalis is a condition observed having foetus with Rh$^{-ve}$ blood and mother with Rh$^{+ve}$ blood.
B. Rh antigen is observed on RBCs in the majority of human beings.
C. Before blood transfusion, Rh group should also be matched.
D. Rh incompatibility is observed when a pregnant mother is Rh$^{-ve}$ and the foetus is Rh$^{+ve}$.
E. Erythroblastosis foetalis can be avoided by administering anti-Rh antibodies to the mother immediately after the delivery of the second child.
Choose the answer from the options given below :
- AC and D only
- BA and B only
- Correct answerCA and E only
- DB and C only
Solution
Statement A is incorrect because erythroblastosis foetalis occurs when a pregnant mother is Rh$^{-ve}$ and the foetus is Rh$^{+ve}$.
Statement B is correct as nearly $80\%$ of humans have the Rh antigen on the surface of their RBCs.
Statement C is correct because Rh compatibility must be checked before blood transfusion to prevent immune reactions.
Statement D is correct as Rh incompatibility arises when an Rh$^{-ve}$ mother carries an Rh$^{+ve}$ foetus.
Statement E is incorrect because erythroblastosis foetalis is prevented by administering anti-Rh antibodies to the Rh$^{-ve}$ mother immediately after the delivery of her first Rh$^{+ve}$ child, not the second child.
Thus, statements A and E are incorrect.
Answer: A and E only
Statement B is correct as nearly $80\%$ of humans have the Rh antigen on the surface of their RBCs.
Statement C is correct because Rh compatibility must be checked before blood transfusion to prevent immune reactions.
Statement D is correct as Rh incompatibility arises when an Rh$^{-ve}$ mother carries an Rh$^{+ve}$ foetus.
Statement E is incorrect because erythroblastosis foetalis is prevented by administering anti-Rh antibodies to the Rh$^{-ve}$ mother immediately after the delivery of her first Rh$^{+ve}$ child, not the second child.
Thus, statements A and E are incorrect.
Answer: A and E only
Hence, the correct answer is option: 'C'.