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Mature mammalian red blood cells are highly efficient because they
AContain large nuclei that produce extra oxygen for the body
BLack nucleus and mitochondria, freeing space for haemoglobin
CHave many mitochondria to make extra ATP for the body
DCarry many ribosomes that make extra haemoglobin daily
Answer & Solution
Correct answer: B. Lack nucleus and mitochondria, freeing space for haemoglobin
1. The chapter notes mammalian RBC lose nucleus and most organelles when mature.
2. Mitochondria too are absent.
3. This frees space for haemoglobin to bind oxygen.
4. Hence option A is correct.
_Source: Selina Concise Biology Class 10, Ch 7 The Circulatory System (Mistral OCR'd PDF), section on RBC_
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