Multiple choice

Which of these is a factor affecting transpiration?

  1. Light

  2. Humidity

  3. Air movement

  4. All of the above

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Transpiration is the loss of water vapor from plant leaves, which is heavily influenced by environmental conditions. Light causes stomata to open, humidity affects the concentration gradient of water vapor, and air movement sweeps away saturated air, meaning all of these factors affect the rate.