Question

Which one of the following is found in coralloid root of Cycas?

• A. Algal zone
• B. Bacterial zone
• C. Fungal zone
• D. All of the above

Answer 1

The correct option is A Algal zone

In addition to normal roots, Cycas also has apogeotropic, unbranched, coral-like roots called coralloid roots. The coralloid roots contain blue-green algae like Nostoc and Anabaena, which can fix atmospheric nitrogen. The blue-green alga is present in a separate algal zone in the cortex of these roots.

So, the correct answer is option A.