Assertion (A): Red blood cells lack a nucleus in mammals.
Reason (R): The absence of a nucleus allows more space for hemoglobin, increasing oxygen-carrying capacity.
A. A is true, but R is false.
B. Both A and R are true, but R is not the correct explanation.
C. Both A and R are true, and R is the correct explanation of A.
D. A is false, but R is true.
Answer: Option C
Solution (By JKExamLibrary)
Mature mammalian RBCs are anucleate, having lost their nucleus during maturation. This provides more space for hemoglobin, enhancing oxygen transport. The reason correctly explains the assertion. Nucleated RBCs are found in other vertebrates.
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