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Science · 2026 · 2 marks
CBSE 2026 · Region 4 · Set 2 · Q12
(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)
Explain the role of UV radiation in the formation of ozone layer.
(b)
Why is UV radiation considered as highly damaging to organisms ?
Marking-scheme solution
(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.
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