Directions for: The questions consist of two statements each, printed as assertion and reason. While answering these questions you are required to choose any one of the following five responses 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 the Reason are true but the Reason is not a correct explanation of Assertion. C. If the Assertion is true but the Reason is false. D. If both the Assertion and the Reason are false. E. If Assertion is false but Reason is true.
Assertion: Nitrogen fixing enzyme in le root nodules function at low oxygen concentration. Reason: Low oxygen concentration provided by leghaemoglobin.A) A
B) B
C) C
D) D
E) E
Correct Answer: A
Solution :
Bacterium Rhizobium is found in the root nodules of legume plants and forms a positive interaction called symbiosis. These bacterium can fix atmospheric nitrogen in these plants. This nitrogen fixation is possible due to presence of enzyme nitrogenase in the bacterium. This enzyme functions under low oxygen concentration or in anaerobic condition. This anaerobic condition. is provided by leghaemoglobin. It combins with oxygen and thus protects nitrogenase by high oxygen concentration.
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