Ocimum Species generally known as Tulsi, is an herbaceous perennial belongs to family Lamiaceae and is considered one of the most important sources of herbal medicine. Objective of the studies was to screen phytochemical component and environmental benefits. The study reveals that various secondary metabolites such as carbohydrates, Protein, alkaloids, flavanoids, glycosides, Terpenoids and phenol are present in tulsi leaf. Alkaloids, glycosides, flavonoids are antibiotic principles of plants and these antibiotic principles are actually defense mechanism of the plant against pathogen.Tulsi plant produces anti-inflammatory and anti- bacterial compounds which helps combat on pollution. Tulsi help in lowering the pollution levels in air and minimizes the effect of air pollution on environment altogether. Tulsi gives out nascent oxygen which absorbs harmful gases like CO, CO2, and SO2 from the environment. Its wellness benefits are known both for human health and environment. In Hinduism this plant is considered holy and is venerated and worshiped in Indian household. The name of Tulsi plant has come also in Holy Quraan in the name of Reihaan.

Keywords : Lamiaceae, Secondary metabolites, Antioxidant, Environment.