The effect of pollution is first and most marked on:

Where are Ecosan toilets used?

The Ministry of Environment and Forest has initiated the Ganga Action Plan and Yamuna Action Plan:
$(i)$ To save these major rivers of our country from pollution.
$(ii)$ It is proposed to build a large number of sewage treatment plants.
$(iii)$ Under these plans,only treated sewage may be discharged into the rivers.

In which of the following is the concentration of $DDT$ highest?

The salinity of the oceans is

Which of the following statements is incorrect?