Name the plants used at places where sewage system is not available.

Explain why some times foaming is seen in river water near the place the place where sewage water is poured after tratement ?

Name the planet of the solar system where life exists.

which of the following are used for the safe disposal of human excreta in those areas where sewerage system dose not exist and water supply is limited or not available at all ?

Name two plant parts where nickel is present

Name two plant parts where nickel is present.