Discussion
Ozone protects the biosphere from high energy
Answer: B
Ozone protects the biosphere from high-energy ultraviolet rays.
The ozone layer in the stratosphere, about 15 to 35 km up, absorbs most of the sun's ultraviolet-B and almost all ultraviolet-C radiation. These wavelengths damage DNA, causing skin cancer and cataracts in people and harming plants and plankton, which is why ozone-depleting substances are controlled under the Montreal Protocol (1987).
Infrared radiation is absorbed mainly by water vapour and carbon dioxide, not ozone. X-rays and gamma rays from space are stopped high in the atmosphere by ordinary oxygen and nitrogen, so the ozone layer is not what protects us from them.
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