Question detail
What role do photosynthetic organisms play in the composition of the Earth's atmosphere?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
- A. They produce carbon dioxide
- B. They consume nitrogen
- C. They produce oxygen
- D. They remove argon
Answer
The correct option is They produce oxygen. This answer is correct because it matches the approved learning objective to recall that the Earth's atmosphere is about 20 percent oxygen in the subtopic The proportions of different gases in the atmosphere.
Explanation
The correct option is They produce oxygen. They produce oxygen is correct because it directly supports the approved learning objective to recall that the Earth's atmosphere is about 20 percent oxygen. This belongs to the subtopic The proportions of different gases in the atmosphere within The composition and evolution of the Earth's atmosphere, 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 The proportions of different gases in the atmosphere.
Common mistake
Oxygen Proportion Misunderstanding
Students often confuse the percentage of oxygen in the atmosphere with that of nitrogen, thinking it is higher than 20 percent.
Remember that the Earth's atmosphere is about 20 percent oxygen and 80 percent nitrogen. Use mnemonic devices or visual aids to help memorize these proportions.
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