Q1
Where does photosynthesis occur?
APlant leaves
BAnimal cells only
CHuman lungs
DNowhere specific
ICSEClass 7 (ICSE)ScienceCh 18 · Topic 1
Photosynthesis and Respiration
Photosynthesis makes food using sunlight in plants, while respiration releases energy from food in all living things, both essential life pr
Core concept
Photosynthesis occurs in plant leaves, using sunlight, water, and carbon dioxide to produce glucose (food) and release oxygen.
How it works
The chemical equation for photosynthesis is: 6CO₂ + 6H₂O + sunlight → C₆H₁₂O₆ + 6O₂.
Why it matters
Respiration occurs in all living cells, breaking down glucose using oxygen to release energy, producing carbon dioxide and water as byproducts.
Key detail
Photosynthesis and respiration are complementary processes, with photosynthesis producing what respiration needs, and vice versa.
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• Photosynthesis makes food using sunlight.
• It occurs in plant leaves.
• It uses sunlight, water and carbon dioxide.
• It produces glucose and releases oxygen.
• Respiration releases energy from food.
• It occurs in all living cells.
• It uses oxygen and produces carbon dioxide, water.
• Photosynthesis and respiration are complementary.