Match the following columns:

Column-$I$	Column-$II$
$(a)$ Biomagnification	$(1)$ Nitrates and Phosphates
$(b)$ Eutrophication	$(2)$ Chlorine
$(c)$ Global warming	$(3)$ $DDT$
$(d)$ Ozone depletion	$(4)$ Greenhouse gases

Match the following.

Column-$I$	Column-$II$
$(p)$ Increasing level of $CO_2$	$(i)$ Ozone depletion
$(q)$ $CFC$	$(ii)$ Antarctica region
$(r)$ Ozone hole	$(iii)$ Greenhouse effect
$(s)$ $UV$ rays	$(iv)$ Senescence of skin

Read the following statements carefully and select the correct ones.
$I.$ $UV$ rays are essential for the production as well as degradation of ozone gas.
$II.$ Ozone present in the ionosphere acts as a shield absorbing $UV$ radiation coming from the sun.
$III.$ One-fourth of the incoming solar radiation is reflected by the atmospheric gases and clouds,and only half of the incoming solar radiation falls on the earth's surface,heating it. Of this,only a small portion is reflected back.

Which of the following statements is incorrect regarding $DDT$?

Domestic waste will result in ..........

Which of the following are advantages of ecological sanitation?
$I.$ It is a practical,hygienic and efficient method of waste disposal
$II.$ It is cost effective
$III.$ Human excreta can be recycled into natural fertilisers,to replace chemical fertilisers