Multiple Choice
Why is calcium important in the diet of many living things?
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1. Introduction to Biology
Introduction to Biology
Multiple Choice
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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