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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
If a plant shows a symptom which could develop due to the deficiency of more than one nutrient how would you find out experimentally, the real deficit mineral?

To find out if the deficiency symptom is due to the deficiency of which nutrient , in the case when more than one nutrient can cause the symptom, a number of wide mouthed bottles is taken. Each is fitted with split cork.

One of them has the normal culture and is called control. While the other bottles have deficiency of one mineral each. For example necrosis is caused by the deficiency of Ca, Mg or K. 
Thus three bottles having defieciency of Ca, Mg and K respectively is taken and the plant is grown in each.

The plants in the three bottles are checked if they have developed chlorosis. If the symptom is corrected by the supply of the particular mineral. Then it is concluded that the deficiency was because of that mineral. 

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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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Which pigment is present in the root nodules of legumes ?

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

Anaerobic.
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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
510 Views

Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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