alleryStratospheric ozone is formed by the action of UV radiation on:
AMolecular oxygen (O₂)
BNitrogen (N₂)
CCarbon dioxide (CO₂)
DWater vapour (H₂O)
Answer & Solution
Correct answer: A. Molecular oxygen (O₂)
1. UV radiation splits O₂ into two oxygen atoms.
2. Each free O atom combines with another O₂ to form O₃ (ozone).
3. This natural cycle creates the ozone layer.
_Source: syllabus Science, Ch 13 "Our Environment", §13.2.1_
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