Question

Why is phloem transport considered an active process?

Answer 1

Phloem transport:

1. Phloem transport is called active because phloem loading at the source and unloading at the sink are both done by active transport.
2. This is a biological process in which molecules move against a concentration gradient, requiring chemical energy to transport biochemical substances from a lower to a higher concentration.
3. As a result, ATP – adenosine triphosphate – is used to pump molecules via a concentration gradient in this process.
4. Sucrose and other organic solutes are transferred from the source to the sink via phloem tissues.