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    Hi, when you are asked about the transport of water, when do you mention the apoplast pathway and the symplast pathway?

    For example in this question: ) Outline the connection between the loss of water from the leaves and the movement of water through the plant

    I only talked about the mass flow and cohesion and adhesion. How do you know when you should be talking about the pathway? Is it when it asks you how does water move from root to xylem? But why is it not necessary to mention the water going into the root from the soil then in this question ? Thanks

    water evaporates from mesophyll cells into air spaces;diffuses out of stoma;loss of water from cells reduces their water potential relative to adjacent cell;water moves from cell with higher water potential to cell with lower water potential (etc);water drawn into mesophyll cells from xylem;water drawn up xylem;cohesive force between water molecules;adhesion force between water molecules and xylem cells;ref to water drawn across root cortex from root hairs to xylem;ref apoplast/symplast/vacuolar pathways; here is the mark scheme

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Updated: February 24, 2016

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