Question

In ......... small specialized roots called coralloid roots

are associated with N -fixing cyanobacteria. 2

(A) Cycas (B) Pinus (C) Ginkgo (D) Moss
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Answer 1

Answer:

a option

Explanation:

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Answer 2

Answer:

The correct answer to be filled in the blank is (A) Cycas

Explanation:

• Cycad roots are the lateral branches of the tap root, heteromorphic, with contractile and small specialized roots called coralloid roots in addition to normal functioning roots.

• The coralloid roots are highly modified roots, with apogeotropic growth and extensive dichotomous branching which comes out of the soil surface in the form of coral-like mass.

• They accommodate symbiotic cyanobacteria which fix atmospheric nitrogen and contribute to the nutrient needs of the plant.

Therefore in Cycas, small specialized coral-like roots called coralloid roots are symbiotically associated with N₂-fixing cyanobacteria.

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