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 falling of leaves. Q, R and S are phytohormones which all promote growth of 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.
P is abscisic acid, a plant growth inhibitor hormone and also promotes the wilting and falling of leaves.
Q is auxin which is responsible for the phenomenon of phototropism in plants, as it is present at the tip of the shoot.
R is gibberellins which involved mainly in shoot extensions because it increases the cell division in a plant shoot and increases its length.
S is cytokinin which is responsible for breaking the dormancy of buds and seeds.
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