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What is the direction of movement of sugars in phloem?

1. Non-multidirectional
2. Upward
3. Downward
4. Bi-directional

Correct answer: Bi-directional

Solution

Phloem transport depends on where sugars are loaded and unloaded, so movement can occur from different sources to different sinks. Because these pathways may be upward or downward in different sieve tubes, the overall direction is bi-directional.

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