I am working on tannery wastewater. Toxic chemicals (organic pollutants) and heavy metals mainly chromium present in tannery wastewater after secondary treatment process.Their wastewater discharge in to water bodies poses a serious threat to the living organisms inhabiting respective ecosystem and also tends to be accumulated in food chain. provide the details of  phytotoxicity, genotoxicity,and genotoxicity test on allium cepa for environmental safety.