Negatively geotropic roots are found in

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(B) Negatively geotropic roots,also known as pneumatophores or respiratory roots,are specialized roots that grow vertically upwards against gravity to

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Cycas

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(B) Negatively geotropic roots,also known as pneumatophores or respiratory roots,are specialized roots that grow vertically upwards against gravity to obtain oxygen in waterlogged or swampy habitats.These are characteristic features of certain mangrove plants like $Rhizophora$ and $Avicennia$.Among the given options,$Cycas$ (a gymnosperm) produces specialized coralloid roots which are apogeotropic (negatively geotropic) and contain symbiotic cyanobacteria ($Anabaena$ or $Nostoc$) for nitrogen fixation.Therefore,$Cycas$ is the correct answer.

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