Multiple choice

Why does sunlight affect transpiration rate?

  1. It opens stomata, which is where water exits

  2. It increases the kinetic energy of the water particles

  3. It increases the concentration gradient between leaf and air
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Sunlight stimulates the guard cells to open the stomata, which allows carbon dioxide to enter the leaf for photosynthesis. Since stomata are open, water vapor can easily diffuse out of the leaf, thereby increasing the rate of transpiration.

Keep practicing — related questions