Section A: Multiple Choice
1. Where does photosynthesis take place?
A. Nucleus
B. Mitochondria
C. Chloroplast
D. Ribosome
✅ Answer: C. Chloroplast
2. Which gas is taken in during photosynthesis?
A. Oxygen
B. Carbon dioxide
C. Nitrogen
D. Hydrogen
✅ Answer: B. Carbon dioxide
3. What is the main product of photosynthesis?
A. Oxygen
B. Water
C. Glucose
D. Carbon dioxide
✅ Answer: C. Glucose
4. Which stage requires sunlight?
A. Calvin cycle
B. Light-independent stage
C. Light-dependent stage
D. Respiration
✅ Answer: C. Light-dependent stage
✍️ Section B: Short Questions
5. Write the balanced equation for photosynthesis
✅ Answer:
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6. Name TWO raw materials needed for photosynthesis
✅ Answer:
Carbon dioxide
Water
7. What is the role of chlorophyll?
✅ Answer:
Chlorophyll absorbs light energy from the sun to drive photosynthesis.
8. Where does the Calvin cycle occur?
✅ Answer:
In the stroma of the chloroplast.
🧠 Section C: Structured Questions
9. Explain the process of the light-dependent stage (4 marks)
✅ Answer:
Occurs in the thylakoids
Chlorophyll absorbs sunlight
Water is split into hydrogen and oxygen
Oxygen is released and energy (ATP & NADPH) is produced
10. Explain the importance of photosynthesis (4 marks)
✅ Answer:
Produces oxygen for respiration
Provides food (glucose) for plants
Forms the base of food chains
Reduces carbon dioxide in the atmosphere
11. Describe THREE factors affecting photosynthesis (6 marks)
✅ Answer:
Light intensity: More light increases rate
Temperature: Higher temps increase rate up to optimum
CO₂ concentration: More CO₂ increases rate
📊 Section D: Data Response
12. A plant was placed under different light intensities. The rate of photosynthesis increased, then leveled off.
Question: Explain why the rate levels off. (3 marks)
✅ Answer:
Another factor becomes limiting (e.g. CO₂ or temperature)
The plant reaches maximum photosynthesis capacity
🧪 Section E: Long Question
13. Describe the process of photosynthesis (10 marks)
✅ Answer (structured):
Photosynthesis occurs in chloroplasts
Light-dependent stage:
Takes place in thylakoids
Light energy absorbed
Water split → oxygen released
ATP & NADPH formed
Calvin cycle:
Occurs in stroma
Uses CO₂, ATP, NADPH
Produces glucose
⚡ Exam Tip
👉 Always include:
Location (where it happens)
Inputs and outputs
Key terms (ATP, NADPH, chlorophyll)