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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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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What is active absorption ?

Active absorption is the uptake of mineral ions against the concentration gradient by consumption of energy.
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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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