Question

Cycads have cyanobacteria on its roots which forms coralloid roots and help in which of the following?

• A. Sulphur fixation
• B. Nitrogen fixation
• C. Phosphorous fixation
• D. All of the above

Answer 1

The correct option is B

Nitrogen fixation

All known Cycads form mutualistic, facultative symbioses with nitrogen-fixing cyanobacteria (formerly known as the blue-green algae). Cycads provide fixed carbon and a stable environment to the cyanobacteria in exchange for fixed nitrogen. These cyanobacteria are endosymbionts, living within the roots of Cycads.