Name an industry which can cause both air and thermal pollution as well as eutrophication.

Acid rain is caused by:

Choose the incorrect sentence regarding $BOD$.

Pollution brings about undesirable changes in the $..........$ characteristics of air,land,or water.

Given below are two statements:
Statement $I:$ In a scrubber,the exhaust from the thermal plant is passed through a spray of water or lime to remove gases like $SO_2$.
Statement $II:$ Particulate matter $(PM\,2.5)$ cannot be removed by a scrubber but can be removed by an electrostatic precipitator.
In the light of the above statements,choose the most appropriate answer from the options given below:

Write a short note on algal bloom.