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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Give a brief account about soil fertility and its depletion.

Soil fertility. It is the ability of soil to provide good growth of plants. It is dependent upon pH value, size of soil particles, presence of minerals, presence of  air , optimum temperature etc.

Depletion of soil fertility is due to the following reasons :

1. Non-rotation of crops causes deficiency of minerals.

2. Precipitation of salts due to change of pH value.

3. Leaching of salts.

4. Over use of the land for cropping.

5. Over grazing.

7. Deforestation.

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.


Which pigment is present in the root nodules of legumes ?


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