Multiple choice

Which of the following options is not an internal factor affecting photosynthesis?

  1. Age of leaf

  2. Amount of water available

  3. Hormones

  4. Carotenoids

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

The amount of water available will affect the rate of photosynthesis because if the plants do not have enough water, stomata will be shut and plants will be deprived of carbon dioxide.