Directions: In the following questions, a statement of assertion (A) ...
90% of naturally occurring atmospheric ozone occurs in the stratosphere. Stratospheric ozone is very important, it removes almost all incoming UVA, and 70% of the incoming UVB at equator, 90% at poles. All aircraft produce water, CO2, CO etc. in exhaust gases. Most commercial flights are confined to the troposphere, but high-level supersonic aircraft inject pollutants into the stratosphere, which leads to the thinning of the ozone layer. Of these nitrogen oxides are especially harmful.
View all questions of this test
Directions: In the following questions, a statement of assertion (A) ...
Assertion : Supersonic jets cause pollution as they thin out ozone.
Reason : Depletion of ozone causes greenhouse effect.
The correct answer is option A: Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
Explanation:
Assertion (A): Supersonic jets cause pollution as they thin out ozone.
Supersonic jets, also known as high-speed aircraft, emit pollutants into the atmosphere during their operation. These pollutants include nitrogen oxides (NOx) and water vapor. When these emissions reach the stratosphere, they can interact with ozone molecules and cause ozone depletion. Ozone depletion refers to the reduction in the concentration of ozone in the stratosphere.
Reason (R): Depletion of ozone causes greenhouse effect.
The depletion of ozone in the stratosphere does not directly cause the greenhouse effect. However, it indirectly contributes to the greenhouse effect by allowing more ultraviolet (UV) radiation from the sun to reach the Earth's surface. This increased UV radiation can warm the Earth's surface and contribute to global warming, which is a part of the greenhouse effect.
Explanation of the reason in relation to the assertion:
The reason provided explains the mechanism by which supersonic jets cause pollution and how ozone depletion, in turn, contributes to the greenhouse effect. The emissions from supersonic jets thin out the ozone layer in the stratosphere, which allows more UV radiation to reach the Earth's surface. This increased UV radiation can contribute to global warming, which is a part of the greenhouse effect.
Conclusion:
Based on the explanation provided, both the assertion and reason are true, and the reason correctly explains the assertion. Therefore, option A is the correct answer.
To make sure you are not studying endlessly, EduRev has designed Class 10 study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Class 10.