Explanation:

The plant growth regulators are small, simple molecules of diverse chemical composition. They can be in form of indole compounds, adenine derivatives, carotenoids derivatives, terpenes or gases like ethylene etc. The plant growth regulators are bifurcated into two groups according to their functions in a living plant body. First group of plant growth regulators are found in growth activities, for instance, cell division, flowering, fruiting and seed formation. The second group of Plant growth regulators are involved in plant responses to wounds and stresses of biotic and abiotic origin.