Question 3
Topic:
8 Marks
Explain the process of photosynthesis and state the raw materials required.
Official Marking Scheme & Model Answer
Model Answer / Key
Photosynthesis is the process where green plants use sunlight to synthesize nutrients from carbon dioxide and water. It requires chlorophyll to trap light energy. The overall chemical equation is 6CO2 + 6H2O -> C6H12O6 + 6O2.
Examiner's Explanation
Focus on key biological terms like "emulsification", "turgidity", and "deoxygenated" to secure maximum marks.
Mark Allocation Criteria
- Definition: Process by which green plants manufacture food using sunlight
- Raw materials: Carbon dioxide and Water
- Conditions: Presence of Chlorophyll and Light energy
- Products: Glucose (starch) and Oxygen