P,Q,R and S are four major types of phytohormones. P is a phytohormone which functions mainly as a growth inhibitor. It promotes the wilting and fallin, of leaves. Q, R and S are phytohormones which all promote growth on plants in various ways. Q is responsible for the phenomenon of phototropism in plants. R is involved mainly in shoot extensions. The phytohormone S helps in breaking the dormancy of seeds and buds. what are P,Q,R and S? Give one reason each for your choice.

Answer

P is abscisic acid; Q is auxin; R is gibberellin; S is cytokinin