Since I was taught evolution I've been wondering why plants did not evolve pigments absorbing the entire electo-magnetic spectrum that arrives on the earth's surface. Then they would appear quite black. But as we all can see they are green, often even light green, which implies even worse energy absorption.
Is the energy too great? Are leaves whiter when they are adapted to a sunny environment? Are leaves very dark only if the plant has adapted to shade? Is the green colour just one of the possibilities to bleed off excess energy?
Is the answer maybe found within the biochemistry of photosynthesis? Are specific wavelengths and thereby energy levels better at driving endothermic reactions?