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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Write the deficiency symptoms of :

(1) iron (2) zinc and calcium.

(1) Iron : It leads to intervenial chlorosis and necrosis. 

(2) Zinc : Due to the deficiency of zinc, young leaves and internodes become extermely small, resulting in little leaf rosette and mottled leaf condition .

Calcium : It's deficiency produces necrosis in the leaf and stem. Plants have a stunted growth with suppressed flowering. Flowers fall immaturely and this process is called premature fall of flower.

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


Name the best known symbiotic nitrogen fixing bacterium.


Which pigment is present in the root nodules of legumes ?


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.

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