Class 11 Biology Mineral Nutrition Symbiotic biological nitrogen fixation

Medium

Select the correct statement.

A
Legumes are incapable of fixing nitrogen.
B
Legumes fix nitrogen through bacteria living in fruits.
C
Legumes fix nitrogen only by bacteria present in root nodules.
D
None of the above.

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Class 11

Biology Questions

Chapter

Mineral Nutrition

Subtopic

Symbiotic biological nitrogen fixation

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$A$ legume having symbiotic association with two nitrogen-fixing bacteria ($Rhizobium$ and $Aerorhizobium$) is

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Assertion : Nitrogen-fixing enzyme in legume root nodules functions at low oxygen concentration.
Reason : Low oxygen concentration is provided by leghaemoglobin.

MediumAIIMS 2004

Nitrogen fixation in root nodules of $Alnus$ is brought about by

Give scientific reasons:
$(1)$ Leguminous plants are rich in protein.

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Leghemoglobin is .....

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