Question

Cycas has _____________ in its coralloid roots.

• A. brown algae
• B. fungi
• C. blue green algae
• D. green algae

Answer 1

The correct option is C blue green algae

Coralloid roots of Cycas have symbiotic association with the blue green algae. The filamentous blue green algae or cyanobacteria help in nitrogen fixation as they have specialised cells called heterocysts. Cycas provides a habitat for the cyanobacteria to grow.