Question

Cyanobacteria are called blue-green algae because they

• A. Are not green
• B. They contain blue and green photosynthetic pigments
• C. Do not produce gametes
• D. Are as small as bacteria

Answer 1

The correct option is B They contain blue and green photosynthetic pigments

Cyanobacteria are called blue-green algae because they contain blue and green photosynthetic pigments. The blue pigment is phycocyanin and green pigment is chlorophyll. They are unicellular prokaryotic organisms. They are capable of synthesizing their own food by the process of photosynthesis. Some Cyanobacteria are also capable of fixing atmospheric nitrogen.

Thus, the correct answer is 'They contain blue and green photosynthetic pigments.'