Question detail
What role did algae play in 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 consumed oxygen.
- B. They produced carbon dioxide.
- C. They produced oxygen through photosynthesis.
- D. They released methane.
Answer
The correct option is They produced oxygen through photosynthesis.. This answer is correct because it matches the approved learning objective to explain that algae and plants produced oxygen by photosynthesis in the subtopic How oxygen increased.
Explanation
The correct option is They produced oxygen through photosynthesis.. They produced oxygen through photosynthesis. is correct because it directly supports the approved learning objective to explain that algae and plants produced oxygen by photosynthesis. This belongs to the subtopic How oxygen increased 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 How oxygen increased.
Common mistake
Misunderstanding Photosynthesis
Students often confuse the process of photosynthesis with respiration, thinking that plants only consume oxygen.
Remember that photosynthesis is the process by which algae and plants produce oxygen using carbon dioxide and sunlight.
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