Parameter Tree:
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > PIGMENTS > CHLOROPHYLL

Definition:
Chlorophyll is the green pigment in plants responsible for absorbing the
light energy required for photosynthesis. 


Reference:
Nebel, Bernard J.and Richard T. Wright. Environmental Science-the Way the World
Works. 1998. Prentice-Hall, Inc. Upper Saddle River, New Jersey.