Hydroponic experiment was conducted to investigate the biochemical responses and accumulation behaviour of cadmium (Cd) in aquatic fern, Ceratopteris pteridoides, under four different levels of exposure. Plants were grown in 10 μM (CdT1), 20 μM (CdT2), 40 μM (CdT3) and 60 μM (CdT4) concentrations of