AQA Biology Photosynthesis Revision Notes
Master AQA Biology Photosynthesis using simple revision notes, key facts and practice questions — all generated by AI for your exam.
Photosynthesis is the process by which green plants, algae, and some bacteria convert light energy into chemical energy in the form of glucose. This process occurs primarily in the chloroplasts of plant cells and involves the absorption of carbon dioxide and water, producing oxygen as a byproduct.
Key Concepts
- 1Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).
- 2Chlorophyll, the green pigment in chloroplasts, absorbs light energy, primarily in the blue and red wavelengths.
- 3Water molecules are split during the light-dependent reactions, releasing oxygen and providing electrons for the electron transport chain.
- 4Carbon dioxide is fixed into glucose during the light-independent reactions using ATP and NADPH produced in the light-dependent reactions.
- 5Factors affecting the rate of photosynthesis include light intensity, carbon dioxide concentration, and temperature.
Simple Explanation
Photosynthesis is how plants make their own food using sunlight. They take in carbon dioxide from the air and water from the soil, and with the help of sunlight, they turn these into glucose, which is a type of sugar. Oxygen is released as a byproduct during this process. Essentially, it's how plants convert light energy into chemical energy.
Memory Trick
“Remember 'COWS' - Carbon dioxide, Oxygen, Water, Sunlight. These are the key components needed for photosynthesis.”
Flashcards
What are the two main stages of photosynthesis?
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Exam Questions
Describe and explain the process of photosynthesis, including the stages involved. [6 marks]
6 marksView mark scheme hint▾
Explain light-dependent and light-independent reactions, mention chlorophyll, ATP, NADPH, and glucose production.
Explain how light intensity affects the rate of photosynthesis. [4 marks]
4 marksView mark scheme hint▾
Discuss the relationship between light intensity and the rate of photosynthesis, including saturation point.
What is meant by the term 'Calvin cycle'? [2 marks]
2 marksView mark scheme hint▾
Define the Calvin cycle and its role in photosynthesis.
Practice Quiz
Which pigment is responsible for capturing light energy in photosynthesis?
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