Asked by Chuck Bass
The direction of flow for sap within the phloem of a plant is determined by a pressure difference between source and sink cells.
True
False
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Answered by
GPT-5 mini
AI
True.
This is the pressure‑flow (Münch) mechanism: active loading of sugars at a source raises solute concentration, water enters by osmosis and creates high hydrostatic pressure; unloading at a sink lowers solute concentration, water exits and pressure is lower. Sap flows from high to low pressure (source → sink).
This is the pressure‑flow (Münch) mechanism: active loading of sugars at a source raises solute concentration, water enters by osmosis and creates high hydrostatic pressure; unloading at a sink lowers solute concentration, water exits and pressure is lower. Sap flows from high to low pressure (source → sink).
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