The cells without nuclei are present in

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(D) In mature angiosperms,the sieve tube elements are living cells that lack a nucleus at maturity. This allows them to conduct food materials more ef

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Members of sieve tube

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(D) In mature angiosperms,the sieve tube elements are living cells that lack a nucleus at maturity. This allows them to conduct food materials more efficiently. Companion cells,which are associated with sieve tubes,retain their nuclei and regulate the metabolic activities of the sieve tube elements.

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