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B
2 only
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C
2 and 3 only
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D
1 and 3 only
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Solution
The correct option is B
2 only Explanation:
Statement 1 is incorrect: The zone separating the troposphere from the stratosphere is known as tropopause.
Statement 2 is correct: The temperature in the troposphere decreases at the rate of 6.5℃ for every km of height.
Statement 3 is incorrect: The stratosphere contains the ozone layer that shields the earth from harmful UV radiations.
Extra Information: The column of the atmosphere is divided into five different layers depending upon the temperature conditions. They are : troposphere, stratosphere, mesosphere, thermosphere and exosphere. Troposphere is the lowermost layer. The temperature in the mesosphere again starts decreasing. Radio waves transmitted from earth are reflected back to the earth by this layer.