Which is produced during water stress that brings stomatal closure

Options :
  1. ethylene
  2. abscisic acid
  3. ferulic acid
  4. caumarin


Answer and Explanation :-

Answer: Option 2

Explanation:

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I am buoyant and expansive and uncontainable--but I always was so, only I never knew it!
-Chitra Banerjee Divakaruni The Palace of Illusions