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Question
Which of the following does not lose their nucleus at maturity?
Options
Companion cells
Red blood cells
Vessel
Sieve tube cells
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Solution
Companion cells
Companion cells are narrow, elongated, thin-walled, living cells. They have dense cytoplasm and a prominent nucleus. Red blood cells of mammals, vessels (xylem elements), and sieve tube cells (phloem elements) lose their nuclei at maturity.
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