📊 Relation to Action Spectrum
🧠 What is Action Spectrum?
It is a graph that shows how effective different wavelengths of light are in driving photosynthesis.
Interestingly, the action spectrum of photosynthesis matches the absorption spectrum of chlorophyll and accessory pigments.
✅ This proves:
- The light that chlorophyll and other pigments absorb (especially blue and red light) is the same light that powers photosynthesis.
- Green light is the least effective, because it is mostly reflected.
📝 Summary – In Simple Words
- Chlorophyll is the main green pigment in plants. It captures sunlight to help make food.
- Chlorophyll-a is essential; others like chlorophyll-b, carotenoids, and phycobilins are helper pigments.
- The structure of chlorophyll includes a light-absorbing head and a tail that holds it in place inside plant cells.
- Chlorophyll absorbs blue and red light best. It reflects green, which is why plants look green.
- Accessory pigments absorb extra light and pass that energy to chlorophyll-a.
- The absorption spectrum shows which light is absorbed. The action spectrum shows which light helps in photosynthesis — and they match.