Answer the following.<br> How does the pollution occur due to vehicles? Gives the names of vehicles causing least …

What is the reason for the increase in the BOD?

In which one of the following, the BOD (Biochemical Oxygen Demand) of sewage (S), distillery …

Oil refineries, paper factories, textile and sugar mills, chemical factories are responsible for water pollution. These …

Which of the following is an example of pollutants whose concentration increases in each trophic level?

In an agriculture field there is a prevalence of the following organism and crop disease which are affection the crop yi…

The major source of BOD in the river Ganga is </h2></div>

What is the excess growth of plankton in water due to the presence of nutrients called?