Question

what is the use of companion cells in phloem

Answer 1

Answer:

it carries food to all parts of the plant

Answer 2

the companion cells control the activity of sieve tube elements by maintaing pressure gradients in them.Sieve cells do not have a nucleus so they are controlled by the companio cells' nucleus. As they are part of phloem they help in bidirectional conduction of food(mainly) in the plants.