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Class 10 Class 12
Describe how nodulation occurs ?

Nodulation : It is the process of formation of nodules. It can be described in in following points.

1. Rhizobiua multiply and colonise the surroundings of roots and get attached to the epidermal and root hair cells.
2. The root hairs curl and bacteria invede it.
3. An infection thread is produced that carries the bacteria to the cortex of the root.
4. Bacteria is then released into the cells and this leads to the differentiation of specialised nitrogen fixing cells.
5. The nodule establishes a direct vascular connection with the root for exchange of nutrients.

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What type of condition is created by leghaemoglobin in the root modules of legumes ?

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

Leghaemoglobin.
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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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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 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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