Multiple Choice
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1. Introduction to Biology
Introduction to Biology
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Which of the following gases helps form Earth's protective shield known as the ozone layer?
A
Nitrogen ($\mathrm{N_2}$)
B
Carbon dioxide ($\mathrm{CO_2}$)
C
Ozone ($\mathrm{O_3}$)
D
Methane ($\mathrm{CH_4}$)
Verified step by step guidance1
Understand the context: The ozone layer is a region in Earth's stratosphere that contains a high concentration of ozone ($\mathrm{O_3}$). It plays a critical role in absorbing and blocking the majority of the Sun's harmful ultraviolet (UV) radiation.
Identify the chemical composition of the gases listed: Nitrogen ($\mathrm{N_2}$), Carbon dioxide ($\mathrm{CO_2}$), Ozone ($\mathrm{O_3}$), and Methane ($\mathrm{CH_4}$). Note that only ozone ($\mathrm{O_3}$) is directly involved in forming the ozone layer.
Recall the process of ozone formation: Ozone ($\mathrm{O_3}$) is formed when oxygen molecules ($\mathrm{O_2}$) are split by UV radiation into individual oxygen atoms, which then combine with other oxygen molecules to form ozone ($\mathrm{O_3}$).
Eliminate the incorrect options: Nitrogen ($\mathrm{N_2}$) and methane ($\mathrm{CH_4}$) are not involved in the formation of the ozone layer. Carbon dioxide ($\mathrm{CO_2}$) is a greenhouse gas but does not contribute to the ozone layer.
Conclude that ozone ($\mathrm{O_3}$) is the correct answer because it is the gas responsible for forming Earth's protective shield known as the ozone layer.
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