Which of the following genera is associated with coralloid roots

Which of the following is not a characteristic of coralloid roots ?

What are coralloid roots ?

Which of the following genera is characterised by the production of geocarpic fruits?

Which organism remains associated with coralloid roots of Cycas ? What is the nature of association and what function does the organism perform inside the Cycas roots ?

What are coralloid roots?

Which of the following shows symbiotic association with root nodules of Casuarina?