Question
Biology Question on Environmental Issues
Ultraviolet radiations from sunlight causes a reaction that produces
A
fluorides
B
carbon monoxide
C
sulphur dioxide
D
ozone.
Answer
ozone.
Explanation
Solution
Ozone is generated in the lower atmosphere during the formation of photochemical smog when nitrogen dioxide splits to produce reactive oxygen atoms which combine with molecular oxygen. Oxygen molecules split under ultraviolet radiations to produce oxygen atoms which combine with molecular oxygen to form ozone. It is this gas which forms the protective ozone umbrella in the stratosphere and shield life from biocidal high energy ; radiations. It can also damage DNA molecules and cause j carcinogenesis.