Plant hormones are signaling molecules that needed for the growth of plants at optimum concentration to govern all the mechanisms of plants development and growth, embryogenesis, organ size regulation, defense from pathogens, tolerance to different stresses and also the reproductive development. The light-inhibition that aggravates the elongation of hypocotyl is controlled by red or far-red light receptor phytohormones that comprising the gibberellins, brassinosteroids, cytokinins, auxin, abscisic acid and ethylene. The level of cytokinin, auxin and GA increased at the fruit-set and constraint of their high level at fruit-set already been noted by their exogenous applications, and which causes the formation of parthenocarpic in tomato. In Arabidopsis, efficient induced germination of dormant seed needs cold-treatment and light activation of photo-chrome system. Germination of seed is plant first and adaptive choice in development and improvements in molecular physiology and genetics have revealed factors which controls the germination of seed. To improve photo-morphogenesis in the seedlings of Arabidopsis, PIF1 is regulated by light facilitated deprivation through the ubiquitin 26-S proteasome passageway. The germination of seed is important stage in the life cycle of plant and the decision made by an imbibing seed to initiate germination can be considered to be a critical regulatory step in plant development.