A photosynthetic prokaryote contains chlorophyll a, may form colonies surrounded by a gelatinous sheath and sometimes de
The features identify cyanobacteria. Cyanobacteria are photosynthetic prokaryotes containing chlorophyll a. Forms such as Nostoc and Anabaena may fix atmospheric nitrogen in specialised cells called heterocysts.
Ref: NCERT Class 11 Biology Chapter 2: Biological Classification Bacteria - Structure and Economic Importance