Question detail
Explain how algae and plants contribute to the increase of oxygen in the Earth's atmosphere.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
The composition and evolution of the Earth's atmosphere
Question
Explain how algae and plants contribute to the increase of oxygen in the Earth's atmosphere.
Answer
Algae and plants produce oxygen through the process of photosynthesis. During photosynthesis, they use sunlight to convert carbon dioxide and water into glucose and oxygen, releasing oxygen as a byproduct into the atmosphere.
Explanation
A strong answer should directly address the approved learning objective to explain that algae and plants produced oxygen by photosynthesis. This question belongs to How oxygen increased within The composition and evolution of the Earth's atmosphere, so the response should use that exact curriculum context rather than a generic statement. The answer is correct when it names the key idea, explains the link to oxygen, and keeps the wording specific to AQA GCSE revision.
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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