Movement of water

Water moves into the plant through the roots, the stem, and into the leaves, and is lost to the atmosphere. Water vapour moves through the stomata (see p117) by diffusion from inside the leaf into the air immediately surrounding the leaf where there is a lower relative humidity (see p41).

The pathway of water movement through the plant falls into three distinct stages:

  • water uptake;
  • movement up the stem;
  • transpiration loss from the leaves.

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