Question detail
How did the increase in photosynthetic organisms affect atmospheric oxygen levels?
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. Oxygen levels decreased rapidly.
- B. Oxygen levels remained constant.
- C. Oxygen levels increased gradually.
- D. Oxygen levels fluctuated wildly.
Answer
The correct option is Oxygen levels increased gradually.. 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 Oxygen levels increased gradually.. Oxygen levels increased gradually. 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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