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(D) Companion cells are specialized parenchymatous cells that are closely associated with sieve tube elements in the phloem of angiosperms.They are co

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Sieve tubes

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(D) Companion cells are specialized parenchymatous cells that are closely associated with sieve tube elements in the phloem of angiosperms.They are connected to the sieve tubes by pit fields present between their common longitudinal walls.Companion cells help in maintaining the pressure gradient in the sieve tubes,which is essential for the translocation of food.

Companion cells are usually seen associated with

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