Pistia is a genus of aquatic plant in the arum family, Araceae. Study showed Crude chloroform and aqueous extracts of the duckweed, Pistia stratiotes L., were bioassayed at various concentrations for larvicidal activities against larvae of Culex mosquito and Artemia salina (brine shrimp). This may yield a more base line data valuable for use in the development of a microbially active chloroform fraction of the plant for possible use in modern medicine. Study yielded. The ethanolic extract of the plant Pistia stratiotes (Araceae) was investigated for activity against Indian earthworms Pheretima posthuma and nematode Ascardi galli. Results indicate The American Type Culture Collection (ATCC) strains and clinical isolates of Trichophyton rubrum, Trichophyton mentagrophytes, Microsporum gypseum, Microsporum nanum and Epidermophyton floccosum were obtained from the Department of Dermatology, Sri Ramachandra Medical College and Research Institute, Porur, Tamil Nadu. Results suggest Free radical stress leads to tissue injury and progression of disease conditions such as arthritis, hemorrhagic shock, atherosclerosis, diabetes, hepatic injury, aging and ischemia, reperfusion injury of many tissues, gastritis, tumor promotion, neurodegenerative diseases and carcinogenesis. Report shows that the potential of water lettuce (Pistia stratiotes L.) to remove chlorpyrifos in water was investigated under laboratory greenhouse conditions. Report shows that the present study discussed the kinetic aspects of leachate decomposition from an aquatic macrophyte, Pistia stratiotes L. (water lettuce). This species was collected from Barra Bonita Reservoir located in the State of São Paulo (Brazil). Report shows that an indoor experiment was undertaken to investigate the response of phytochelatins and their relationship to cadmium toxicity in Pistia stratiotes L., a freefloating macrophyte, exposed to low concentrations of cadmium typically found in realistic environments. Report shows that antibiotics are frequently used in the United States as feed efficiency promoters and medicines for livestock that is destined for human consumption. These antibiotics are released into the environment through the runoff and wastewater streams from animal feedlots and land applications of manure. It shows a variety of actions, which increase the probability & interest of a researcher & companies to research & made products through it.