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(C) Sieve tubes are the main conducting elements of phloem in angiosperms. They lack a nucleus at maturity and are dependent on companion cells for th

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Companion cells

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(C) Sieve tubes are the main conducting elements of phloem in angiosperms. They lack a nucleus at maturity and are dependent on companion cells for their metabolic activities. Companion cells are specialized parenchyma cells that are closely associated with sieve tube elements via plasmodesmata. They maintain the pressure gradient in the sieve tubes and regulate the loading and unloading of sugars.

Which cells are functionally associated with sieve tubes?

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