Question

In which layer of the atmosphere, ozone is maximum concentrated?
(a)Troposphere
(b)Stratosphere
(c)Mesosphere
(d)Ionosphere

Answer 1

Hint: The most concentrated part of the ozone layer is found 15 and 35 km above the Earth’s surface. This layer of atmosphere extends up to 50 km. Almost 24% of the Earth’s atmosphere is contributed by this layer. The ozone layer present here is known as ‘good ozone’.

Complete step-by-step answer:
The most concentrated ozone molecules( about 90%) are found in the second part of the atmosphere that is the Stratosphere. This stratospheric region with the highest ozone concentration is regarded as the “ozone layer”. The ozone layer naturally acts as a shield for the earth's life from the harmful effect of ultraviolet radiation, produced from the sun.

Additional Information: The atmosphere has 4 atmospheric layers, namely Troposphere, Stratosphere, Mesosphere, and Ionosphere. These layers are vertically divided based on their temperature.

-The troposphere is the first region of the atmosphere as we go up and it extends upward to about 10 km above sea level. We, humans, are living in this layer of atmosphere and mostly all the weather patterns are observed in this layer. Hence it is called a ‘Zone of Weather’.It is the layer of the atmosphere where the maximum density of the atmosphere is observed.
-Moving upward, there comes the second layer of the atmosphere called the Stratosphere, which is found above the troposphere. Most concentrated ozone molecules are found in this region. It acts as a shield for the earth’s life from the harmful ultraviolet(UV) rays that are produced from the sun. Heat is released by the absorption of these UV rays and this eventually leads to the heating up of the atmosphere.
-Above the stratosphere, we can find the third layer of the atmosphere known as Mesosphere. As the altitude increases in this region, the temperature seems to be decreased here.
The stratosphere and mesosphere are collectively known as the middle layer of the atmosphere.
-The ionosphere is the upper layer of the atmosphere and is the most ionized part. It is the region of the atmosphere where the parts of the mesosphere and exosphere are found. This ionosphere is ionized by solar radiation and plays a vital role in atmospheric electricity.

So, the correct answer is, “Stratosphere.”

Note: The ozone layer is getting depleted day by day due to various ozone-depleting agents. The major ones are chlorofluorocarbons, nitrogen oxides, sulphur dioxides, halon, carbon tetrachloride, methyl chloroform, and chlorine. Depletion of ozone can lead to disorders like skin cancers, snow blindness, cataract, mutations, etc. It can also bring a reduction in the potential of our immune system.