Transpiration · Botany

What is the primary definition of transpiration in plants?

  1. The absorption of water from the soil by root hair cells
  2. The loss of water as vapor from the aerial parts of the plant
  3. The transport of prepared food materials through the phloem
  4. The upward movement of sap through the xylem vessels of the stem
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Correct answer: The loss of water as vapor from the aerial parts of the plant

Transpiration is the biological process where water is lost as water vapor through specialized structures like stomata. It is distinct from evaporation as it is regulated by the plant's physiological mechanisms.

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