Home » Pigment mainly responsible for photosynthesis in red algae is…. Algae MCQs Pigment mainly responsible for photosynthesis in red algae is…. December 31, 2021 3 Views Q. Pigment mainly responsible for photosynthesis in red algae is…. Phycoerythrin Chlorophyll aCarotene Xanthophyll. Answer: Chlorophyll a