Cynobacteria are also known as blue green algae. They are considered simplest organisms, which can prepare their own food.
Habitat: -
They are found in moist places.
Structure: -
i) They are usually unicellular.
ii) Some live in colonies or filamentous.
iii) Each filament consists of many cells, which are attached to each other.
iv) They have a mucilaginous sheath around cell for protection.
Nitrogen fixation: -
Some cynobacteria has ability to fix nitrogenous compounds in soil and can improve the fertility of soil.
Reproduction: -
Only asexual reproduction takes place in cynobacteria. They divide by cell division, spore formation and fragmentation.