Question

Which of the following is the life support of sieve tube in phloem?

• A. Phloem fibres
• B. Tracheids
• C. Vessels
• D. Companion cells

Answer 1

The correct option is D Companion cells

Sieve cells are tube like elongated cells in the phloem. These are the main conducting elements in the phloem tissue. The sieve tubes are the cells with no nuclei or the nuclei is fragmented. There are companion cells which are present adjacent to the sieve tube cells. These are the cells have a nucleus. The nucleus of the companion cells performs the functions for both the cells. Hence, the companion cells are called as life support cells for the sieve tubes.

Thus, the correct answer is option D.