Which one of the following is involved in the closing of stomata?
Correct answer: C. Abscisic acid
- A. Gibberellins
- B. Ethane
- C. Abscisic acid
- D. Cytokinine
Explanation
Answer is "Abscisis acid"Explanation: Hormones are involved in stomatal movement in plants. At high temperature when leaf cells start wilting a hormone is released by mesophyll cells. This hormone is called abscisic acid. This hormone stops the active transport of K+into guard cells, overriding the effect of light and CO2 concentration. So K+ pumping stops. Stomata close.
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