Biology 9700 · AS & A Level · Transport mechanisms

Transport mechanisms — practice question

When transpiration is occurring at its highest rate, tree trunks become smaller in diameter. Which statement accounts for this?

  • AThere is decreased suction pressure in the leaves.
  • BThere is less adhesion between water and xylem vessel walls.
  • CThere is less water in the xylem vessels.
  • DThe water in the xylem vessels is under increased tension.

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