Home » Pigment mainly responsible for photosynthesis in red algae is…. Algae MCQs Pigment mainly responsible for photosynthesis in red algae is…. December 31, 2021 10 Views Q. Pigment mainly responsible for photosynthesis in red algae is…. Phycoerythrin Chlorophyll aCarotene Xanthophyll. Answer: Chlorophyll a