The possibility of photochemical smog formation is more at

Given below are two statements:
Statement $I$: Non-biodegradable wastes are generated by the thermal power plants.
Statement $II$: Bio-degradable detergents lead to eutrophication.
In the light of the above statements,choose the most appropriate answer from the options given below:

The stratosphere extends from sea level up to an altitude of $...$ kilometers.

The eutrophication of water body results in ...... .

Explain why sometimes foaming is seen in river water near the place where sewage water is poured after treatment?

State the measures to control environmental pollution.