Burning of fossil fuels affects which of the following cycles?

Eutrophication is caused by

Which of the following plants is used for the purification of water?

Soil conservation can be best achieved by having

Match the following and choose the correct combination from the options given:
Column $I$ | Column $II$
$(1)$ $DDT$ | $(p)$ $CO, CO_2$
$(2)$ $PAN$ | $(q)$ Smog
$(3)$ Acid rain | $(r)$ Biological magnification
$(4)$ Global warming | $(s)$ $SO_2$

What percentage of incoming solar radiation is reflected and absorbed by clouds and gases before reaching the Earth's surface (in $\%$)?