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 transformation of carbon dioxide and water into glucose and oxygen, using sunlight as the energy source.
Key Concepts
- 1Photosynthesis occurs in two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).
- 2Chlorophyll is the pigment that absorbs light energy, primarily in the blue and red wavelengths.
- 3The overall equation for photosynthesis is 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.
- 4Light-dependent reactions produce ATP and NADPH, which are used in the Calvin cycle.
- 5Factors affecting the rate of photosynthesis include light intensity, carbon dioxide concentration, and temperature.
Simple Explanation
Photosynthesis is how plants make their food using sunlight, water, and carbon dioxide. They take in sunlight through their leaves and use it to turn water and carbon dioxide into glucose, which they use for energy. Oxygen is released as a byproduct of this process. Essentially, it's how plants convert light into energy.
Memory Trick
“Remember 'LCO' for Photosynthesis: Light, Carbon Dioxide, Oxygen. This helps recall that plants need light and carbon dioxide to produce oxygen and glucose.”
Flashcards
What is the main pigment involved in photosynthesis?
Tap to reveal answer
Exam Questions
Describe and explain the process of photosynthesis. [6 marks]
6 marksView mark scheme hint▾
Include light-dependent reactions, Calvin cycle, and overall equation.
Explain how light intensity affects the rate of photosynthesis. [4 marks]
4 marksView mark scheme hint▾
Discuss the relationship between light intensity and photosynthesis rate.
What is meant by the term 'photosynthesis'? [2 marks]
2 marksView mark scheme hint▾
Define photosynthesis and mention its importance to plants.
Practice Quiz
What is the primary function of chlorophyll in photosynthesis?
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