Learning objective
Describe how oxygen levels increased gradually as photosynthetic organisms became more widespread.
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Topic
The composition and evolution of the Earth's atmosphere
Subtopic
How oxygen increased
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Quick explanation
Describe how oxygen levels increased gradually as photosynthetic organisms became more widespread
- This point belongs to The composition and evolution of the Earth's atmosphere, especially How oxygen increased.
- You need to be able to describe how oxygen levels increased gradually as photosynthetic organisms became more widespread.
- The key ideas to know are oxygen.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect How oxygen increased to exam-style questions, flashcards, and revision notes for The composition and evolution of the Earth's atmosphere.
Quick student answer
How does how oxygen levels increased gradually work?
Direct answer
In Chemistry, this page helps you answer questions about how oxygen levels increased gradually within The composition and evolution of the Earth's atmosphere. Focus on the key process, correct scientific terms, and how the idea links to exam-style questions. Key terms to check are photosynthesis and oxygen levels.
Key terms
- photosynthesis: The process by which green plants and some other organisms use sunlight to synthesize foods with the help of chlorophyll, producing oxygen as a byproduct.
- oxygen levels: The concentration of oxygen in the atmosphere, which increased gradually due to the activity of photosynthetic organisms.
Common trap
Misunderstanding Oxygen Increase: Emphasize that oxygen levels increased gradually over time as photosynthetic organisms became more widespread.
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Revision notestopic notes
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Open revision notesRelated learning objectives
- Recall that the Earth's atmosphere is about 80 percent nitrogen.
The proportions of different gases in the atmosphere
- Recall that the Earth's atmosphere is about 20 percent oxygen.
The proportions of different gases in the atmosphere
- Recall that the Earth's atmosphere contains small proportions of other gases including carbon dioxide, water vapour and noble gases.
The proportions of different gases in the atmosphere
- Interpret simple data showing the proportions of gases in the atmosphere.
The proportions of different gases in the atmosphere
- Distinguish the major gases in the present atmosphere from trace atmospheric gases.
The proportions of different gases in the atmosphere