Companion cells are closely associated with :

Options

(a) Sieve elements
(b) Vessel elements
(c) Trichomes
(d) Guard cells

Correct Answer:

Sieve elements

Explanation:

Companion cells are narrow, elongated and thin walled living cells. They lie on the sides of the sieve tubes and are closely associated with them through compound plasmodesmata. It is supposed that the nuclei of the companion cells control the activities of the sieve tube through plasmodesmata. Companion cells also help in maintaining a proper pressure gradient in the sieve tube elements