Biology 9700 · AS & A Level · Water

Water — practice question

Which statement best explains why water molecules are pulled through xylem vessel elements as a result of transpiration?

  • AWater molecules form hydrogen bonds with cellulose in the walls of xylem vessel elements in a process known as adhesion.
  • BWater molecules form hydrogen bonds with neighbouring water molecules in a process known as cohesion.
  • CWater molecules form ionic bonds with dissolved mineral ions, which helps to keep the water molecules together in a continuous column.
  • DWater has a high latent heat of vaporisation and this prevents the evaporation of water in the xylem vessel elements.

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