Gibberellin are the harmones produced in meri stems of stems. They regular different tissue in different states.

These chemical substances are naturally produced in plants . They are capable of regulating their important processes.Different pant hormones help to coordinate growth , development and responses to the environmenent.
types of plant hormones:-
A) Auxin:- are usually in the tip of shoots . It helps them to grow longer when plants are placed facing a light source, they show bending towards it.
B)Gibberellins:- the hormones that help in the growth of stem and flower.
C) Cytokinins:- are the hormones , which promote cell division. Highest concentration of cytokinis occurs in fruit n seeds.
4) Abscisic acid:- is a growth inhibitior.It is responsible for the wilting of leavs.