Edexcel Biology Photosynthesis Revision Notes
Master Edexcel 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 the conversion 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 responsible for capturing light energy.
- 3The overall equation for photosynthesis is 6CO2 + 6H2O + light energy → C6H12O6 + 6O2.
- 4Light-dependent reactions take place in the thylakoid membranes, producing ATP and NADPH.
- 5The Calvin cycle occurs in the stroma, where ATP and NADPH are used to convert CO2 into glucose.
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 convert these into glucose, which is a type of sugar. Oxygen is released as a byproduct. This process is essential for life on Earth, as it provides energy for plants and oxygen for animals.
Memory Trick
“Remember 'COWS' for Photosynthesis: Carbon dioxide, Oxygen, Water, Sunlight.”
Flashcards
What is the main pigment involved in 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▾
Mention light-dependent reactions, Calvin cycle, and the role of chlorophyll.
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, including limiting factors.
What is meant by the term 'photosynthesis'? [2 marks]
2 marksView mark scheme hint▾
Define photosynthesis and mention its importance.
Practice Quiz
What is the primary function of chlorophyll in photosynthesis?
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