which of the following is not a physiological effect of ABA

1. inhibitaion of growth
2. tropic response
3. role in water stress
4. abscission

Hello Student
Correct Answer is 4. Abscission
Abscission means shedding of various parts of a plant such as leaf, fruit, flower, seed, etc.
Chadwick and Burg (1967) proposed the effect of ethyene for positive geotropic movement of plants.