Which one of the following statements about transport of nutrients in phloem is correct?

Question

Quizplus · Accepted Answer

Differences in osmotic concentration between the source and sink cause a pressure gradient known as the pressure flow hypothesis. This causes the flow of phloem sap from the source (where nutrients are produced) to the sink (where nutrients are either stored or utilized). It is a passive process and does not require any energy from the plant. Therefore, options A and B are incorrect. Option D is incorrect as a sink is any part of the plant where nutrients are utilized or stored, and not specifically where a particular solute is produced.

Which One of the Following Statements About Transport of Nutrients