Plant science is a branch of botany mainly it deals with the biochemical, genetic, physiological aspects of plants. Plants provide us oxygen to breathe, food, fuel. Plants are ideal systems to study about changing environmental conditions and to study the influence of changing environmental conditions on epigenetic patterns. Plant scientist are Researching to find innovative ways to protect our forests, and for finding new fuel sources, and to reduce contamination of food. Plant science is mainly divided in to the three segments agronomy and horticulture and forestry.