Multiple choice

Which of the following plant genera has coralloid root?

  1. Cycas

  2. Vinca

  3. Dahlia

  4. Rose

  5. Pomegranate

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A Correct answer
Explanation

Roots in some genera of gymnosperm have fungal association in the form of mycorrhiza (Pinus) while in some others (Cycas), small specialised roots called coralloid roots are associated with nitrogen fixing cyanobacteria, i.e. cycas.