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

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

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Sieve tubes of angiosperms

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(D) Companion cells are specialized parenchyma cells that are closely associated with the sieve tube elements in the phloem of angiosperms.They are connected to the sieve tube elements through pit fields present between their common longitudinal walls.These cells help in maintaining the pressure gradient in the sieve tubes and are essential for the translocation of food materials.Therefore,the correct option is $D$.

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