Multiple Choice
In an ecosystem, how do primary consumers benefit plants?
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48. Ecology
Introduction to Ecology
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Which of the following gases are considered major greenhouse gases that contribute to the greenhouse effect?
A
Oxygen ($\mathrm{O_2}$)
B
Methane ($\mathrm{CH_4}$)
C
Nitrous oxide ($\mathrm{N_2O}$)
D
Carbon dioxide ($\mathrm{CO_2}$)
Verified step by step guidance1
Step 1: Understand the concept of greenhouse gases. Greenhouse gases are atmospheric gases that trap heat by absorbing and emitting infrared radiation, contributing to the greenhouse effect and global warming.
Step 2: Identify the major greenhouse gases. Common greenhouse gases include carbon dioxide ($\mathrm{CO_2}$), methane ($\mathrm{CH_4}$), nitrous oxide ($\mathrm{N_2O}$), water vapor ($\mathrm{H_2O}$), and ozone ($\mathrm{O_3}$).
Step 3: Evaluate the gases listed in the problem. Oxygen ($\mathrm{O_2}$) is not considered a greenhouse gas because it does not significantly absorb infrared radiation. However, methane ($\mathrm{CH_4}$), nitrous oxide ($\mathrm{N_2O}$), and carbon dioxide ($\mathrm{CO_2}$) are all major greenhouse gases.
Step 4: Recall the role of each greenhouse gas. Carbon dioxide ($\mathrm{CO_2}$) is released through processes like fossil fuel combustion and deforestation. Methane ($\mathrm{CH_4}$) is emitted during agricultural activities and decomposition of organic matter. Nitrous oxide ($\mathrm{N_2O}$) is released from agricultural and industrial activities, as well as combustion of fossil fuels.
Step 5: Conclude that the correct answers are methane ($\mathrm{CH_4}$), nitrous oxide ($\mathrm{N_2O}$), and carbon dioxide ($\mathrm{CO_2}$), as they are all major contributors to the greenhouse effect.
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