The loading of dissolved sugars into the sieve tube elements of phloem is:
A) passive transport.
B) active transport.
C) osmosis.
D) simple diffusion.
E) facilitated diffusion.

Question

Quizplus · Accepted Answer

The loading of dissolved sugars into the sieve tube elements of phloem is an active process, requiring energy in the form of ATP to move sugars against their concentration gradient from the photosynthetic cells where they are produced into the phloem sieve tube elements.

The Loading of Dissolved Sugars into the Sieve Tube Elements