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Class 10 Class 12
Mention the artificial methods involved in the restoration of soil fertility.

Artificial methods That restore the fertility of soil are :

(1) By adding farm yard manure or animal excreta to the soil.

(3) By green manuring.

(4) By crop rotation.

(5) By controlling over-grazing.

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

Anaerobic.

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

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.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.

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