Assertion (A): High concentration of ozone in the lower troposphere is desirable.
Reason (R): Ozone present in the atmosphere protects the living organisms on the surface of earth from the harmful ultra-violet radiation of the sun.
Choose the correct answer from the options given below:
(A) is false but (R) is true
Judge the Assertion and the Reason separately. The Assertion claims that a high concentration of ozone in the lower troposphere (ground-level ozone) is desirable. This is false: tropospheric ozone is a harmful secondary pollutant that damages the lungs, injures crops and is a component of photochemical smog; a high concentration near the surface is undesirable.
The Reason states that ozone in the atmosphere protects living organisms from harmful ultraviolet radiation. This is true, but it refers to stratospheric ozone (the ozone layer high above the surface), not the tropospheric ozone mentioned in the Assertion. So the Assertion is false while the Reason is true.
Hence the correct evaluation is that the Assertion is false but the Reason is true.
Correct answer: (A) is false but (R) is true
Similar Questions
Which of the following substances has the least Ozone Depleting Potential?
Montreal protocol was signed in order to address which of the following environmental issues?
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Despite the fact that Chloro Fluoro Carbons(CFCs) are evenly distributed over the globe, the Ozone depletion is significantly pronounced over the south pole.
Reason R: The presence of ice crystals over the south pole makes chlorine to oxygen bonding tougher.
In the light of the above statements, choose the most appropriate answer from the options given below.
Important Questions from Ozone Layer Depletion
- Which of the following is a catalytically inactive (or reservoir) molecule containing chlorine in stratosphere?
- Choose the correct statement(s)
A. O$_3$ in stratosphere is not completely effective in shielding us from UV-B
B. UV-A is biologically least harmful.
C. Chapman mechanism deals with only O$_3$ formation in stratosphere.
D. Sunscreen lotions either reflect or absorb or scatter UV-B and UV-A
E. UV-B helps in dissociation of O$_3$ molecule in stratosphere.
Choose the correct answer from the options given below. Ozone layer depletion is a major phenomenon in :
- With regard to ozone depletion over Antarctica, select the false statement :
- Atmospheric life times of CFCs is typically in the range :
