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Assertion (A) : Azolla is used as a biofertilizer in rice fields. Reason (R) : Azolla contains nitrogen fixing cyanobacteria in its root nodules
The correct answer is
(1) Both (A) and (R) are true and (R) is not the correct explanation of (A)
(2) (A) is true but (R) is false
(3) (A) is false but (R) is true
(4) Both (A) and (R) are true and (R) is the correct explanation of (A)
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