Botany - Plant Kingdom Question with Solution | TestHub

Cycas forms facultative symbiotic association with autotrophic nitrogen fixing cyanobacteria.Cycasprovide fixed carbon and a stable environment to the cyanobacteria in exchange for fixed nitrogen. These cyanobacteria are endosymbionts and live within the roots ofCycas. In addition to normal roots,Cycasdevelops specialised symbiotic organs at a young age called precorallioa roots which transform into coralloid roots upon successful colonisation bycyanobacteria.