Which of the following principles of green chemistry suggests the use of chemicals made from plant-based sources?

The metal ion responsible for the Minamata disease is

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

Given below are two statements :
Statement $I$ : If $BOD$ is $4\,ppm$ and dissolved oxygen is $8\,ppm$,then it is a good quality water.
Statement $II$ : If the concentration of zinc and nitrate salts are $5\,ppm$ each,then it can be a good quality water.
In the light of the above statements,choose the most appropriate answer from the options given below :

How do chlorofluorocarbons (CFCs) deplete the ozone layer in the stratosphere? Explain with the associated chemical reactions.

Which of the given statements are correct, when carboxyhaemoglobin reaches $3-4 \%$ in blood?
$(I)$ Leads to headache
$(II)$ Results in cardiovascular problems
$(III)$ Increases the body temperature
$(IV)$ Leads to diarrhoea