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Mineral Nutrition

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Why do plants need potassium and magnesium ?

Potassium and magnesium both are essential elements as

Potassium -  is involved in maintaining the turgidity of cells and in the activation of enzymes. It helps in the opening and closing of stomata, to determine anion-cation balance in the cells, formation of cell membrane and in translocation of organic solutes in the phloem.

Magnesium-  is a constituent of chlorophyll. It is required in fat synthesis and nucleic acid synthesis. It activates enzyme in phosphate metabolism.

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Name the best known symbiotic nitrogen fixing bacterium.

Rhizobium.
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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
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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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