During photosynthesis, chlorophyll absorbs energy from red and blue light. The molecules, 'excited' by the absorbed light, transfer electrons to energy-carrier substances in the cell, thus providing energy for making carbohydrates.
Photosynthetic bacteria have a special type of chlorophyll called bacteriochlorophyll .
The Macmillan Encyclopedia 2001 4. photosynthesis A Dictionary of Food and Nutrition 5. All rights reserved.