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Q54 (CGS/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Consider the following statements :

I. Blood of 'A' group has anti-B antibodies in plasma.
II. Blood of 'AB' group has both 'A' and 'B' antigens in RBCs.
III. Blood of 'AB' group cannot be given to a person having 'A' blood group.
IV. Blood of 'O' group does not possess any antibody in plasma.

Which of the statements given above are correct?

Result
Your answer: —  Â·  Correct: D

Explanation

The ABO blood group system is determined by the presence or absence of specific antigens on RBCs and antibodies in the plasma:

  • Statement I is correct: Individuals with blood group A have A-antigens on their RBCs and anti-B antibodies in their plasma.
  • Statement II is correct: Blood group AB is characterized by having both A and B antigens on the RBC surface, but no anti-A or anti-B antibodies in the plasma.
  • Statement III is correct: A person with group A blood has anti-B antibodies. If they receive AB blood, their antibodies will attack the B-antigens on the donor's RBCs, leading to agglutination.
  • Statement IV is incorrect: Blood group O has no antigens on the RBCs, but the plasma contains both anti-A and anti-B antibodies.

Thus, statements I, II, and III are correct.

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