🌿 Life science
Photosynthesis
Light, water and CO₂ in; glucose and oxygen out.
Photosynthesis
💬 Questions and answers
1What am I looking at?
Answer: A green leaf taking in sunlight, water and carbon dioxide and giving out oxygen.
2What are its parts? (click a part to identify it)
Answer: Leaf with chlorophyll, sunlight, water from the roots, carbon dioxide from the air, glucose and oxygen.
3How does it work?
Answer: Chlorophyll absorbs light energy, which is used to join carbon dioxide and water into glucose; oxygen is released through the stomata.
4Why is it important?
Answer: Almost all food chains start with photosynthesis, and it supplies the oxygen we breathe.
5What happens if I change something? (use the sliders)
Answer: Slide the sunlight down to zero and watch the rate of photosynthesis fall.
6What should I remember for the exam?
Answer: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂ (in the presence of light and chlorophyll). Starch test with iodine shows that light and chlorophyll are needed.