Question

The ozone layer ‘ozonosphere’ occurs in
A. Thermosphere
B. Troposphere
C. Stratosphere
D. Heterosphere

Answer 1

Hint: The ozone layer is the protective shield of the Earth’s atmosphere that inhibits the sun’s harmful rays to enter the Earth. The atmosphere of the Earth is composed of varying gases. Based on the densities of these gases they are distributed in different layers. These layers are called zones. The ozone layer is present at 26 to 30 kilometers above the Earth’s surface.

Complete answer:The ozone layer is a composition of ozone gases. The ozone molecule is represented as $$O_3$$. It is present in the lowermost layer of the stratosphere. The stratosphere makes the second zone of the Earth’s atmosphere. It lies above the troposphere and just below the mesosphere. The stratosphere has two divisions based on temperature. The hotter layers lie in the higher stratosphere and the cooler layers lie in the lower stratosphere. The ozone layer lies in the lower or the cooler stratosphere. The composition of ozone can change based on the geographical range and the climatic change.
The ozone layer is helpful in protecting the Earth from the sun’s harmful ultraviolet rays. The ozone layer was discovered by Fabry and Henri Buisson. It lies 30 kilometers above the Earth’s surface.
The troposphere represents the Earth’s surface. It extends up to a region of 11 kilometers. It mainly consists of carbon dioxide, oxygen, hydrogen, nitrogen, and water vapor. The thermosphere is the fourth major zone of the atmosphere which lies at 85 to 500 kilometers above the Earth’s surface. The major gases in this region are oxygen and nitrous oxide. The heterosphere is the second major division of the atmosphere that lies at 80 to 100 kilometers above the Earth’s surface.
Hence, we can conclude from the above discussion that the right answer is option C. Stratosphere

Note: The ozone layer is a very sensitive layer but has a major role in sustaining life on Earth. The increasing levels of global warming have resulted in the deterioration of the ozone layer. The ozone hole or the depleted region of ozone lies in the regions of the Antarctic.