Which of the following one of the following weeds is effective in controlling water pollution caused by industrial effluents -

Water hycinth.Water hyacinth (Eichhornia crassipes) is used for purifying not only domestic wastewater but also industrial wastewater. Other studies have evaluated the potential of water hyacinth to absorb various organic chemicals like phenols & toxaphene. It can readily absorb, accumulate & concentrate heavy metals such as lead, cadmium, mercury & nickel. Water hyacinth can remove even radioactive metals from industrial effluents, which is very difficult otherwise.