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Mineral Nutrition

Short Answer Type

51. Name two Macro and micro nutrients

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52. What is the importance of boron in plant life ?

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53. Name the essential elements :

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Long Answer Type

54. Write the deficiency symptoms of :

(1) iron (2) zinc and calcium.

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Short Answer Type

55. In what amount macronutrients and micronutrients are required.

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Long Answer Type

56. Describe the natural method of nitrogen fixation.

Natural method of nitrogen fixation : When lightening occurs, atmospheric nitrogen and oxygen combine to form NO. The nitric oxide [NO] combines with oxygen to from NO₂. This nitrogen dioxide combines with rain water to form HNO (Hyponitrous acid) and HNO₂ or HNO₂ and HNO₃. These nitrous acids and nitric acid are washed into the soil along with rain water and cause Acid Rain. This acidic rain water combines with other mineral salts to form nitrities and nitrates. The nitrites and nitrates are absorbed by the plants.