First slide

Phloem Transport: Flow from Source to Sink

Question

Choose the correct option regarding transport of sugars in phloem.

Easy

A

Loading of sugars into sieve tube is an active process while unloading in passive.
B

Loading of sugars into sieve tube is a passive process while unloading in active.
C

Both loading and unloading of phloem is done passively.
D

Both loading and unloading of phloem is done actively.

Solution

The movement of sugars in the phloem begins at the source, where sugars are loaded (actively transported) into a sieve tube.
At the sink, incoming sugars are actively transported out of the phloem and removed as complex carbohydrates.

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