Light and energy is captured by the green pigment and
(its a question for homework and i cant answer it)

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

if you know your abc's you should be able to get your answer or just use google