Most of the plants contain a variety of compounds that are principally active and work against the free radicals. Out of potentially active compounds in the medicinal plants, antioxidants are the most important of all the compounds. There are various flavonoids and antioxidants compounds that are actually possessing the chemical structure with the high stability. Seed biology is an intensive area of study, a reflection of the significance of seeds for several scientific areas. Animal mediated seed dispersal is important for sustaining biological diversity in forest ecosystems, particularly in the tropics. From an evolutionary perspective, the ability of plants to make seeds has conferred major selective advantages, accounting, in part, for the success of seed plants as the largest and most species rich group of land plants. It is important to remove the free radicals that are produced biochemically in the specific organ in order to keep as well as minimize the effects produced by the free radicals. The antioxidants possess certain properties that differentiated them to the other chemical compounds. Animals that are highly vagile are considered to be the most efficient at active dispersal. Highly vagile animals include many species of birds, bats, and large insects. Large aquatic animals are effective dispersers, and some terrestrial animals can disperse large distances on foot. Seed sensitivity to nitrate is affected by other environmental factors, such as light and after-ripening, and by genotypes. Biochemical eptides are the several types of the peptides that are found in the inner portion of the onions. These peptides are gamma-glutamyl-methionine, gamma-glutamyl-isoleucine, gamma-glutamyl-leucine and gamma-glutamyl-valine.