Biology for IGCSE & O level - Transport In Plants (Section 3 - No. 29)
In the pressure flow hypothesis for translocation, how is the movement of sugars in the phloem driven?
By the difference in water potential between the source and the sink.
By the concentration gradient of sugars in the phloem.
By active transport of sugars.
By the force exerted by the stomata.
Explanation
The pressure flow hypothesis explains how sugars are transported in the phloem, and is driven by differences in turgor pressure (water potential) between source and sink.
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