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A common characteristic feature of plant sieve tube cells and most of mammalian erythrocytes is
a) Absence of mitochondria
b) Presence of cell wall
c) Presence of haemoglobin
d) Absence of nucleus

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Ans. The answer is the option (d) Absence of nucleus
Explanation: Sieve tubes are one of the components of phloem, and they do not contain a nucleus. In a similar manner, erythrocytes in mammalian cells also do not contain a nucleus.

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