Chlorophyll:

The genetic name for any several oil-soluble green tetrapyrrole plant pigments which function as photoreceptors of light energy for photosynthesis. (Parker, 1997) It is the green pigment in plants that function in photosynthesis by absorbing radiant energy from the Sun, predominantly from blue (435 - 438 nm) and red (670 - 680 nm) regions of the spectrum. The light removes an election from the chlorophyll molecule. This is used to produce either ATP or NADP for carbon dioxide fixation. (Allaby, 1998)