Case Based-III: Ozone is an important component present in stratosphere. It act as a blanket to protect the living organisms from the harmful ultraviolet radiations of sun by absorbing it. Its amount is measured with the help of Dobson spectrometer. This layer has started depleting due to air pollution. Pollutants like hydrofluorocarbons, chlorofluorocarbons and so on are responsible for it. These pollutants are called ozone depleting substances (ODS). This depletion is termed as Ozone hole which was first discovered over Antarctica in the year 1985. Thinning of this layer can cause serious problems like skin cancer, cataract, damage to immune system, mortality of embryo etc.
1. Ozone is important as:
a. It absorbs far infrared rays
b. It absorbs ultraviolet rays
c. It does not absorb ultraviolet rays
d. It absorbs all the radiations of sun
2. Which of the following can be considered as harmful effect of depletion of ozone?
a. Immune system is damaged
b. Increase in the rate of skin cancer
c. None of these
d. Both (a) and (b)
3. Select the ozone depleting substance (ODS) from the following options.
a. Chlorofluorocarbons (CFCs)
b. Oxygen \( \left(\mathrm{O}_{2}\right) \)
c. Nitrogen \( \left(\mathrm{N}_{2}\right) \)
d. Methane \( \left(\mathrm{CH}_{4}\right) \)
4. Measurement of ozone in stratosphere is done with the help of
a. Spirometer
b. Stethoscope
c. Dobson spectrometer
d. Rain gauge
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