Different Lights - Knowledgebase Question

Falmouth, ME
Question by peter10
March 26, 2000
Why does red light affect the growth of plants?

Answer from NGA
March 26, 2000


Chlorophyll, the pigment in plants that makes them appear green, absorbs light principally in the violet, blue and red wavelengths of the spectrum. Most plants also have a very small amount of a pigment called phytochrome, which is particularly sensitive to red and far-red light. Red light starts a chemical reaction in the plant which causes some seeds to germinate, some plants to flower, etc. It depends on what the specific plant is.

I would suggest that you find a good botany text book for a more technical explanation. Good luck!

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