ï»¿ Write a note on symbiotic nitrogen fixation. from Biology Mineral Nutrition Class 11 Assam Board

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Write a note on symbiotic nitrogen fixation.

Symbiotic nitrogen fixing bacteria : These bacteria are found associated with roots of higher plant e.g. Rhizobium leguminosarum is found in nodules of roots of leguminous plants. Frankia is found in the roots of Alnus. These bacteria fix atmospheric nitrogen and make it available to the plant.

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How is nitrogenase enzyme protected ?

The nitrogenase enzyme is very sensitive to the molecular oxygen. It requires anaerobic conditions to work. The leg-haemoglobin in the nodule acts as an oxygen scavenger just meainting the anaerobic condition needed by the enzyme.
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What type of condition is created by leghaemoglobin in the root modules of legumes ?

Anaerobic.
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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.
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What is Hidden hunger in the case of plants?

Hidden hunger refers to a situation in which a crop needs more of a given nutrient yet has shown no deficiency symptoms. The nutrient content is above the deficiency symptom zone but still considerably needed for optimum crop production
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