Cells without a nucleus are found in:

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(D) Sieve tube elements are the main conducting cells of the phloem in angiosperms.At maturity,these cells lose their nucleus and other organelles lik

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Sieve tube elements

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(D) Sieve tube elements are the main conducting cells of the phloem in angiosperms.At maturity,these cells lose their nucleus and other organelles like ribosomes and vacuoles to facilitate the efficient transport of food (sucrose).However,they remain alive and maintain their metabolic functions through the help of adjacent companion cells,which possess a nucleus and are connected to the sieve tube elements via plasmodesmata.

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