Question 1
Question detail
What is a primary source of carbon monoxide in the atmosphere?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Common atmospheric pollutants and their sources
Question
- A. Incomplete combustion of fuels
- B. Complete combustion of fuels
- C. Evaporation of water
- D. Photosynthesis
Answer
The correct option is Incomplete combustion of fuels. This answer is correct because it matches the approved learning objective to explain why carbon monoxide is toxic because it reduces the ability of blood to carry oxygen in the subtopic Properties and effects of atmospheric pollutants.
Explanation
The correct option is Incomplete combustion of fuels. Incomplete combustion of fuels is correct because it directly supports the approved learning objective to explain why carbon monoxide is toxic because it reduces the ability of blood to carry oxygen. This belongs to the subtopic Properties and effects of atmospheric pollutants within Common atmospheric pollutants and their sources, so the explanation must stay tied to that curriculum context. The other options are incorrect because they either do not answer this learning objective, use a vague statement, or move away from Properties and effects of atmospheric pollutants.
Common mistake
Misunderstanding Carbon Monoxide Toxicity
Students often think carbon monoxide is toxic because it is a poison, without understanding its specific effect on blood.
Clarify that carbon monoxide binds to hemoglobin in red blood cells, reducing their ability to carry oxygen, which is the reason for its toxicity.
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