Home » Pigment mainly responsible for photosynthesis in red algae is…. Algae MCQs Pigment mainly responsible for photosynthesis in red algae is…. December 31, 2021 4 Views Q. Pigment mainly responsible for photosynthesis in red algae is…. Phycoerythrin Chlorophyll aCarotene Xanthophyll. Answer: Chlorophyll a