Match the greenhouse gases with their sources: Greenhouse gases Source

a. Methane 1. Landfills

b. Carbon dioxide 2. Fossil fuel burning

c. Nitrous oxide 3. Agricultural fertilizers

Choose the most appropriate option from below :

1. A

   a-3, b-2, c-1

2. B

   a-1, b-2, c-3

3. C

   a-1, b-3, c-2

4. D

   a-2, b-1, c-3

Appeared in: Raj. CHO -2025

Explanation

• Methane (CH4) is primarily produced from the anaerobic decomposition of organic waste in landfills and from livestock.
• Carbon dioxide (CO2) is the main greenhouse gas released from the combustion of fossil fuels (coal, oil, gas) for energy and transportation, as confirmed in the source text.
• Nitrous oxide (N2O) emissions are largely from agricultural soil management, especially the use of synthetic and organic fertilizers.
• The correct sequence of matches is therefore Methane with Landfills (a-1), Carbon dioxide with Fossil fuel burning (b-2), and Nitrous oxide with Agricultural fertilizers (c-3).

Why Other Options Were Wrong

• Option A: This option incorrectly matches Methane with agricultural fertilizers (a-3) and Nitrous oxide with landfills (c-1). While agriculture produces some methane, landfills are a more direct match from the options, and fertilizers are the primary source of nitrous oxide.
• Option C: This option incorrectly matches Carbon dioxide with agricultural fertilizers (b-3) and Nitrous oxide with fossil fuel burning (c-2). The primary source of CO2 is fossil fuel combustion, and the primary source of N2O is fertilizer use.
• Option D: This option incorrectly matches Methane with fossil fuel burning (a-2) and Carbon dioxide with landfills (b-1). Fossil fuel burning is the main source of CO2, and landfills are a major source of methane.

Related Visual

• Visual 1: Infographic: A chart illustrating the primary sources of Methane, Carbon Dioxide, and Nitrous Oxide emissions to visually reinforce the correct pairings.

Clinical Relevance

• Nursing practice connection: Prioritize focused assessment, early escalation, and real-time monitoring when managing Sources of major greenhouse gases in acute care settings.
• Understanding the sources of greenhouse gases is crucial for community health nurses to advise on public health issues related to air pollution and climate change.
• Air pollution from these sources can exacerbate respiratory conditions like asthma and COPD, and contribute to cardiovascular diseases.
• Nurses can advocate for policies that reduce emissions and promote sustainable practices, contributing to a healthier environment for their communities.

How to Approach the Question

• First, identify the items to be matched: three greenhouse gases on one side and three potential sources on the other.
• Address each gas one by one. Recall or deduce the primary source for each from the given list.
• Start with the most well-known pairing. Carbon dioxide (b) is famously linked to the burning of fossil fuels (2). So, you are looking for an option with 'b-2'.
• Next, consider Methane (a). It is commonly associated with decomposition in places like landfills and from livestock. This links 'a' with '1'.
• By elimination, Nitrous oxide (c) must be paired with agricultural fertilizers (3). This is also a correct and known association.
• Finally, search for the option that contains all three correct pairings: a-1, b-2, and c-3.

Concept Tested & Keywords

• Concept Tested: Sources of major greenhouse gases
• Stem keywords: greenhouse gases, Methane, Carbon dioxide, Nitrous oxide, sources
• Lead-in keywords: Match
• Negative lead-in flag: false

Question ID

Q8iKrEtgdfjeMTDT9Qr_W2

Copy ID