61.Which was first photosynthetic organism? A. Red algae B. Green algae C. Cyanobacteria D. Protobionts
Option C Cyanobacteria are also known as Cyanophyta, are a phylum of bacteria that obtain their energy through photosynthesis and are the only photosynthetic prokaryotes able to produce oxygen The Oldest micro-fossils discovered so far are that of photosynthetic bacteria that appeared 3.3 to 3.5 billion years ago. Hence Cyanobacteria was the first photosynthetic organism.
