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

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Sieve elements

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(C) 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 tube elements by pit fields present between their common longitudinal walls. Companion cells maintain the pressure gradient in the sieve tubes and help in the translocation of food materials.

Companion cells are closely associated with . . . . . . .

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