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(C) The coralloid roots of $Cycas$ exhibit a specialized internal structure.These roots are apogeotropic (grow upwards) and dichotomously branched.In

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Coralloid roots of $Cycas$

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(C) The coralloid roots of $Cycas$ exhibit a specialized internal structure.These roots are apogeotropic (grow upwards) and dichotomously branched.In the cortex of these roots,a distinct region known as the algal zone is present.This zone contains symbiotic cyanobacteria,such as $Anabaena$ and $Nostoc$,which help in nitrogen fixation.

The algal zone is a characteristic feature of:

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