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(B) Statement $(a)$ is correct: Nitrogenase is a heterodimeric protein consisting of two subunits,$Mo-Fe$ protein and $Fe$ protein.Statement $(b)$ is

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$(a), (c)$

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(B) Statement $(a)$ is correct: Nitrogenase is a heterodimeric protein consisting of two subunits,$Mo-Fe$ protein and $Fe$ protein.Statement $(b)$ is incorrect: Root hair curling is caused by the interaction between bacterial 'nod factors' and plant root hair receptors,not by nitrogenase.Statement $(c)$ is correct: During symbiotic $N_2$ fixation,the host legume plant provides the necessary $ATP$ and carbon source to the bacteria for the energy-intensive process of nitrogen fixation.Therefore,statements $(a)$ and $(c)$ are correct.

Select the correct statements from the given:
$(a)$ Nitrogenase is a heterodimeric protein.
$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.
$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.

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Select the correct statements from the given:$(a)$ Nitrogenase is a heterodimeric protein.$(b)$ Root hairs curl by action of nitrogenase and plant 'nod factors'.$(c)$ During symbiotic $N_2$ fixation,$ATP$ is provided by the legume plant.