Q1. [3] straightforward initial-understanding
Describe in brief the three events that occur during photosynthesis.
Generated by claude-sonnet-4-6 · 2026-06-15 06:43 · grounding rag
Model Answer
The three events that occur during photosynthesis are:
- Absorption of light energy by chlorophyll – Chlorophyll present in the chloroplasts of plant cells absorbs sunlight.
- Conversion of light energy to chemical energy and splitting of water molecules – The absorbed light energy is converted into chemical energy, and water molecules are split into hydrogen and oxygen.
- Reduction of carbon dioxide to carbohydrates – The hydrogen produced is used to reduce CO₂ to form carbohydrates, which store energy for the plant.
Source: Life Processes, Section 5.2.1 Autotrophic Nutrition
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Explanation
- The examiner expects all three events listed exactly as given in the textbook — one point per mark.
- Use the correct scientific terms: "absorption," "conversion," "splitting of water," and "reduction of CO₂."
- Do not confuse the order; examiners check that all three are mentioned clearly.
- Avoid adding unnecessary detail (e.g., light vs. dark reactions) — it goes beyond the textbook scope for this question.