Question

P, Q, R, 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 the growth of the plant in various ways.
• Q is responsible for the phenomenon of phototropism in plants.
• R is involved mainly in shoot extension.
• The phytohormones S helps in breaking the dormancy of seeds and buds.

What are P, Q, R, and S?

Answer 1

P is abscisic acid which is responsible for wilting and falling of leaves

Q is auxins which are responsible for the phenomenon of phototropism in plants i.e plants bend towards the light.

R and S are gibberellins which increase the axis length in plants or shoot extension and also help it helps in breaking the dormancy of seeds and buds.