The function of companion cells is

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(D) : Companion cells are specialized parenchyma cells associated with sieve tube elements. They play a crucial role in the loading of sucrose into si

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loading of sucrose into sieve elements

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(D) : Companion cells are specialized parenchyma cells associated with sieve tube elements. They play a crucial role in the loading of sucrose into sieve tube elements. In source tissues like leaves,companion cells use transmembrane proteins to actively transport sugars and amino acids into the sieve tube elements. This active loading of sugars creates a high solute concentration,which lowers the water potential,thereby facilitating the movement of water and sugars through the phloem.

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