(a)

Explain the role of UV radiation in the formation of ozone layer.

(b)

Why is UV radiation considered as highly damaging to organisms ?

(a) \(\displaystyle \mathrm{O}_{2} \xrightarrow{\text { uv }} \mathrm{O}+\mathrm{O}\) \[\mathrm{O}+\mathrm{O}_{2} \longrightarrow \mathrm{O}_{3} \] (Ozone) UV radiations split molecular oxygen into free oxygen and these atoms combine with oxygen to form ozone.

(b) It can cause diseases like skin cancer in human beings.