When daylight hours are less and temperatures are cooler, photosynthesis slows down and there is less chlorophyll production. This reduction reveals yellow or orange pigment called carotenoids and are ...

This article was originally published with the title “ The Role of Chlorophyll in Photosynthesis ” in Scientific American Magazine Vol. 213 No. 1 (July 1965), p. 74 doi:10.1038 ...