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Which control do plants exert over transpiration?

  • A.The temperature of the leaf, which the plant regulates independently of the temperature of the air around it
  • B.Stomatal opening in response to light and water stress
  • C.The albedo of the leaf surface, which determines how much of the available energy is absorbed for evaporation
  • D.Root depth alone

Answer: B

Stomata open in light to admit carbon dioxide and close under water stress or high vapour pressure deficit, giving the plant active control over its water loss. This physiological regulation is what distinguishes transpiration from evaporation from an open water surface. Root depth determines the water available rather than the rate at which it is used.

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