A red pigment present in the root nodules of leguminous plants is known as
A
Phycoerythrin
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B
Bacteriochlorophyll
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C
Leghaemoglobin
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D
Bacterioviridin
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Solution
The correct option is D Leghaemoglobin Leguminous plants are in symbiotic association with nitrogen-fixing bacteria like Rhizobium. These bacteria invade root hairs of leguminous plants and forms root nodules in which they fix nitrogen. A red pigment present in the root nodules of leguminous plants is known as leghaemoglobin. Leghaemoglobin is an oxygen-carrier molecule. It protects nitrogen-fixing enzyme nitrogenase from the side effect of oxygen as the enzyme is highly sensitive to oxygen.