Photosynthesis and Plant Nutrition

Where this fits in the syllabus

Grade 10 · Term 2

Key points to revise

Revise Photosynthesis and Plant Nutrition fast with concise, exam-ready key points

About O/L Science: O/L Science integrates physics, chemistry, and biology into a single subject across Grade 10 and 11.

• Equation: 6CO₂ + 6H₂O + light energy → C₆H₁₂O₆ + 6O₂
• Location: chloroplasts (contains chlorophyll — absorbs red and blue light)
• Two stages: light-dependent (in thylakoid); light-independent / Calvin cycle (in stroma)
• Glucose used for respiration, growth, cellulose, starch, fats

Must know

• Limiting factors: light intensity, CO₂ concentration, temperature, water
• Starch test: iodine turns blue-black on a leaf that has photosynthesised
• Respiration (reverse): C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP
• Photosynthesis = base of almost all food chains

Source: NIE O/L Science Grade 10 — Unit 3: Photosynthesis

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