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  4. Assertion :Type 'O' blood group individuals are called 'universal donors'. Reason :RBCs of 'O' blood group have both 'A' and 'B' surface antigens.

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Q. Assertion :Type $'O'$ blood group individuals are called 'universal donors'.
Reason :$RBCs$ of $'O'$ blood group have both $'A'$ and $'B'$ surface antigens.

Body Fluids and Circulation

Solution:

If a blood transfusion is made between an incompatible donor and recipient, reaction of antigens on the cells and antibodies in the plasma produces clots that clog the capillaries. Type $O$ blood group individuals are without $A$ and $B$ antigens on their $RBCs$, but have antibodies for both these antigens in their plasma. Hence, these can donate blood to anyone.