Blood Groups and Significance · NCERT Biology

In the ABO system, if a person has group A blood, which antigen-antibody combination do they possess?

  1. Antigen A and anti-A antibody
  2. Antigen B and anti-A antibody
  3. Antigen A and anti-B antibody
  4. Antigen B and anti-B antibody
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Correct answer: Antigen A and anti-B antibody

A person with blood group A has the 'A' antigen on their RBCs. To prevent self-destruction, they produce antibodies against the 'B' antigen (anti-B) in their plasma.

Difficulty: Medium Question 18 of 20

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