OCR Biology Photosynthesis Revision Notes
Master OCR 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 mainly in the chloroplasts of plant cells and involves two main stages: the light-dependent reactions and the light-independent reactions (Calvin cycle).
Key Concepts
- 1Photosynthesis occurs in chloroplasts, primarily in the leaves.
- 2The overall equation for photosynthesis is 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.
- 3Light-dependent reactions convert light energy into chemical energy (ATP and NADPH).
- 4Light-independent reactions (Calvin cycle) use ATP and NADPH to synthesize glucose from CO2.
- 5Factors affecting photosynthesis include light intensity, carbon dioxide concentration, and temperature.
Simple Explanation
Photosynthesis is how plants make their food using sunlight, carbon dioxide from the air, and water from the soil. They use a green pigment called chlorophyll to capture sunlight, which helps convert these ingredients into glucose, a type of sugar, and oxygen. This process is essential for life on Earth as it provides energy for plants and oxygen for animals.
Memory Trick
“Remember 'PLANT' for Photosynthesis: P for Photosynthesis, L for Light-dependent reactions, A for ATP, N for NADPH, T for The Calvin cycle.”
Flashcards
What is the primary pigment involved in photosynthesis?
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Exam Questions
Describe and explain the process of photosynthesis, including its stages and products. [6 marks]
6 marksView mark scheme hint▾
Mention chloroplasts, light-dependent reactions, ATP, NADPH, Calvin cycle, glucose, and oxygen.
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 'light-dependent reactions'? [2 marks]
2 marksView mark scheme hint▾
Define light-dependent reactions and mention their location and main products.
Practice Quiz
What is the main function of chlorophyll in photosynthesis?
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