A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
In Cycas, the primary root persists and forms a tap-root system. Some of the lateral roots branch repeatedly to form dwarfed dichotomously branched coral-like masses. They are called the coralloid roots or corallorhiza. They become inhibited by a blue green alga Anabaena cycadacearum. The blue-green algae fixes atmopsheric N2 and thus plants get fixed nitrogen.
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