Question

Function of companion cells is:

• A. Providing energy to sieve elements for active transport.
• B. Loading of sucrose into sieve elements by passive transport.
• C. Providing water to phloem.
• D. Loading of sucrose into sieve elementsby active transport.

Answer 1

The correct option is D

Loading of sucrose into sieve elementsby active transport.

Function of companion cell is to load sugar and amino acids into sieve elements. These cells use transmembrane proteins to take up these molecules by active transport.