Which of the following pigments is essential for nitrogen fixation by leguminous plants?
A
Anthocyanin
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B
Phycocyanin
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C
Phycoerythrin
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D
Leghaemoglobin
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Solution
The correct option is C Leghaemoglobin Leghaemoglobin is the pigment essential for nitrogen fixation in root nodules of leguminous plants. It protects the nitrogen fixing enzyme system from oxygen, which is detrimental for the enzyme system fixing atmospheric nitrogen. Phycocyanin and phycoerythrin are pigments found in cyanobacteria and red algae and anthocyanin is red purple colour pigment found in fruits, flowers and other parts of angiosperms.