alleryCoralloid roots, with associated nitrogen-fixing cyanobacteria, are seen in
ACycas, a gymnosperm cycad
BMarchantia, a liverwort thalloid
CSelaginella, a pteridophyte
DPinus, a gymnosperm conifer
Answer & Solution
Correct answer: A. Cycas, a gymnosperm cycad
Cycas (cycad) has specialised 'coralloid' roots in which cyanobacteria (e.g., Anabaena) fix atmospheric nitrogen.
Pinus has mycorrhizal associations of a different (fungal) kind.
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