Question

I. Unicellular, colonial, filamentous, marine or terrestrial forms
II. The colonies are surrounded by a gelatinous sheath
III. Some can fix atmospheric nitrogen in specialised cells called heterocysts
IV. They often form blooms in water bodies
These above characters are seen in

• A. Chrysophytes
• B. Dinoflagellates
• C. Archaebacteria
• D. Cyanobacteria

Answer 1

The correct option is D Cyanobacteria

Characteristics of Cyanobacteria

• Unicellular, colonial, filamentous, marine or terrestrial forms
• The colonies are surrounded by a gelatinous sheath
• Some can fix atmospheric nitrogen in specialised cells called heterocysts
• They often form blooms in water bodies