Question

Which of the following statement is incorrect ?
(a) A person of 'O' blood group has anti 'A' and anti 'B' antibodies in his blood plasma.
(b) A person of 'B' blood group can't donate blood to a person of 'A' group
(c) Blood group is designated on the basis of the presence of antibodies in the blood plasma.

Answer 1

Option (c) Blood group is designated on the basis of the presence of antibodies in the blood plasma.

ABO blood grouping in human is based on the presence or absence of two surface antigens on the RBCs namely A and B. Similarly, the plasma of different individuals contain antibodies. This distribution of antigens and antibodies in the four groups of blood A,B,AB and O are as follows

Blood Groups and Donors Compatibility
$\begin{array}{cccc}\text{Blood Group}& \text{Antigens on RBCs}& \text{Antibodies in Plasma}& \text{Donor's Group}\\ \text{A}& \text{A}& \text{anti-B}& \text{A, O}\\ \text{B}& \text{B}& \text{anti-A}& \text{B, O}\\ \text{AB}& \text{A, B}& \text{nil}& \text{AB, A,B,O}\\ \text{O}& \text{nil}& \text{anti-A, B}& \text{O}\end{array}$
Thus, among the four blood groups, O group is the universal donor and AB group is the universal recipient.