Question

All of the following statements are correct for blue green algae, except

• A. they have chlorophyll - a, which is also found in higher plants.
• B. they may be filamentous, colonial, or unicellular.
• C. they have heterocysts which are clear cells without chlorophyll.
• D. they are connecting link between plants and animals.

Answer 1

Answer: (D)

Cyanobacteria have autotrophic nutrition and can perform photosynthesis with the help of chlorophyll-a which is similar in green plants. They may be unicellular, colonial, or filamentous forms. Nitrogen fixation in cyanobacteria mainly occurs in specialized cells called heterocysts. Heterocysts are large-sized, pale-colored, non-motile, mucilage free thick-walled cells that are impermeable to oxygen. Euglena is the connecting link between plants and animals.