Which of the following microorganism contains chlorophyll ?

Cyanobacteria

The correct answer is Option (2) –Cyanobacteria

Chlorophyll is the key pigment that is responsible for the process of photosynthesis through which the photoautotrophs make their food. Chlorophyll is majorly of two types. These are chlorophyll a and chlorophyll b. chlorophyll a is the primary pigment and chlorophyll b is the accessory pigment. Cyanobacteria are prokaryotic bacteria that are photosynthetic. They lack organized chloroplasts as present in eukaryotes. Their photosynthetic apparatus is distributed peripherally inside the cytoplasm. The blue-green bacteria do contain chlorophyll a and produce free oxygen as a photosynthesis byproduct.