Identify the gymnosperm that has coralloid roots ASSOCIATED with N₂-fixing cyanobacteria.
APinus
BCycas
CGinkgo
DSequoia
Answer & Solution
Correct answer: B. Cycas
Cycas has SMALL specialised roots called CORALLOID ROOTS that house N₂-fixing cyanobacteria. Pinus has mycorrhizal (fungal) root associations. Sequoia is the giant redwood. Ginkgo is another gymnosperm but without coralloid roots.
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