Question

Why do plants absorb blue and red light?

Answer 1

Photosynthesis:

1. Photosynthesis is the process in which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar.
2. Red and blue light is believed to have a higher quantum yield of CO₂ assimilation.
3. The blue and red parts of the spectrum are effective to satisfy the energy requirement of plants.
4. Hence plants absorb these two colors more than any other color.
5. A large spectral region exists between 500nm and 600nm that does not get absorbed by the chlorophyll.
6. This effectively causes the plants to appear green.