As you know, blood of human beings differ in certain aspects though it appears to be similar. Various types of grouping of blood has been done. Two such groupings – the ABO and Rh – are widely used all over the world.
Assertion (A): The Rh blood group system is named after Rhesus monkeys. Reason (R): The Rh antigen was first discovered in human blood and later found to be absent in Rhesus monkeys.
Correct answer: C — If assertion is true but reason is false.
NCERT states “the Rh antigen similar to one present in Rhesus monkeys (hence Rh)” confirming the naming origin (Assertion true). However, the Reason is false - NCERT indicates the antigen was found to be similar to one present IN Rhesus monkeys, not absent from them.
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