Q.

Which of the following are the specialised roots of Cycas that are associated with nitrogen-fixing cyanobacteria? 

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a

Leguminous roots

b

Coral roots

c

Corals

d

Coralloid roots

answer is C.

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Detailed Solution

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Coralloid roots are specialised roots found in Cycas sp. that are associated with nitrogen-fixing cyanobacteria. The coralloid root contains the cyanobacterial zone, which is inhabited by cyanobacteria. This has unique properties that contribute to the close relationship between Cycas sp. and cyanobacteria.

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