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    Mineral Nutrition
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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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    What is active absorption ?

    Active absorption is the uptake of mineral ions against the concentration gradient by consumption of energy.
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    What are Chemoautotrophs ?
    Chemoautotrophs are those organism which obtain energy by oxidising inorganic chemicals to synthesis their organic food. For examples- bacteria are chemoautotrophs. 
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    When a section of root nodule of a legume is examined it appears pinkish. Why ?
    The pink colour of the root is due to the presence of the pigment leg-haemoglobin. 
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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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