Given below are two statements:

Statement I : In polluted water values of both dissolved oxygen and $$\mathrm{BOD}$$ are very low.

Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.

In the light of the above statements, choose the most appropriate answer from the options given below :

Given below are two statements:

Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry.

Statement II : The fuel obtained from plastic waste is lead free.

In the light of the above statements, choose the most appropriate answer from the options given below :

The photochemical smog does not generally contain:

The acid that is believed to be mainly responsible for the damage of Taj Mahal is