Cytoplasmic strands are present in

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(C) Sieve tube elements are specialized cells of the phloem that lack a nucleus at maturity but retain a thin layer of cytoplasm along the cell wall.

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Sieve tubes

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(C) Sieve tube elements are specialized cells of the phloem that lack a nucleus at maturity but retain a thin layer of cytoplasm along the cell wall. This cytoplasm is connected to adjacent companion cells through cytoplasmic strands that pass through the sieve pores. Tracheids,vessels,and wood fibers are dead cells at maturity and do not contain cytoplasm.

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