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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Name the four broad categories of essential elements.

Essential elements can be grouped into four broad categories on the basis of their diverse functions. These categories are :

1. Structural elements

2. Energy related molecules 

3. Activators or inhibitors of enzymes.

4. Elements which alter the osmotic potential. 


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

Anaerobic.

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.

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.

Which pigment is present in the root nodules of legumes ?

Leghaemoglobin.