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(D) In $Cycas$, the coralloid roots are specialized root structures that grow upwards and branch dichotomously. These roots contain cyanobacteria (suc

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Mutualism

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(D) In $Cycas$, the coralloid roots are specialized root structures that grow upwards and branch dichotomously. These roots contain cyanobacteria (such as $Anabaena$ or $Nostoc$) in their cortical cells. The cyanobacteria fix atmospheric nitrogen for the plant, while the plant provides shelter and nutrients to the cyanobacteria. This mutually beneficial interaction is known as $Mutualism$ (or symbiosis).

What is the relationship between the seeds of Cycas and its coralloid roots?

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