Question

Companion cells are associated with

• A. tracheids
• B. phloem parenchyma
• C. sieve tubes
• D. xylem vessels

Answer 1

The Correct Option is C

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.

Answer 2

Ans: The companion cells are associated with the sieve tubes. They are present in the phloem tissue of the vascular plants. They help in supporting and transporting the  nutrients throughout the plants. They maintain the concentration gradients of the solutes and sugar through the plants. 

The connection between the companion cells and sieve tubes are with the help of plasmodesmata. They  help in the exchange of molecules and signalling pathways. 

The companion cells help in the process of loading and unloading of the organic nutrients from the source to the sink. This is done when a long distance transport is needed.