Question detail
Describe the role of algae in increasing atmospheric oxygen levels.
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
Describe the role of algae in increasing atmospheric oxygen levels.
Answer
Algae play a crucial role in increasing atmospheric oxygen levels by performing photosynthesis. As they convert carbon dioxide into glucose, they release oxygen as a byproduct, contributing significantly to the oxygen present in the atmosphere.
Explanation
A strong answer should directly address the approved learning objective to explain that photosynthesis removed carbon dioxide from the atmosphere. 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 carbon dioxide, and keeps the wording specific to AQA GCSE revision.
Common mistake
Misunderstanding Photosynthesis
Students often think that photosynthesis only produces oxygen without recognizing that it also removes carbon dioxide from the atmosphere.
Emphasize that photosynthesis is a process where plants and algae convert carbon dioxide and water into glucose and oxygen, thus removing carbon dioxide from the atmosphere.
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