Which of the following plants have red pigment in their roots?

Radish

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Mustard

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Soybean

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Maize

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Solution

The correct option is B Soybean
Soybean is a legume plant having root nodules, which harbor nitrogen-fixing bacteria Rhizobium.
Rhizobium is microaerobic bacteria and the nitrogenase enzyme is highly sensitive to oxygen. Hence, nodules consist of reddish or pinkish pigment leghemoglobin, which binds any free oxygen and prevents destruction of enzyme nitrogenase.
So, the correct answer is 'Soybean'

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Roots of which plant contains a red pigment which have affinity for oxygen?

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