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Mineral Nutrition

Long Answer Type

81. Describe how nodulation occurs ?

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82. Name at least five different deficiency symptoms in plants. Describe them and correlate them with concerned mineral deficiency.

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Short Answer Type

83. What do you understand by heterotrophic mode of nutrition ?

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Long Answer Type

84.

Why is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?

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85. What are the conditions necessary for fixation of atmospheric N₂ by Rhizobium ? What is their role in N₂ fixation.

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Short Answer Type

86. Describe the passive mineral absorption.

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Long Answer Type

87. All elements that are present in plant need not be essential to its survival. Comment.

All elements present in the plant need not be essential to its survival. For a element to be essential it has to meet all the criteria for essentiality. The criteria for essentiality are :

i. The element must be absolutely esential for supporting the normal growth and reproduction. The plant should be unable to complete its lifecycle in the absene of the element.

ii. The element requirement should be specific and not replaceble by another element.

iii. The element must be directly involved in the metabolism of the plant.

Since, all the elements do not meet all the criteria, they are not considered to be essential to the plant.

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Short Answer Type

88. Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?

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89. How are the minerals absorbed by the plants?

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90.

Which of the following statements are true? If false, correct them.

1. Boron deficiency leads to stout axis.

2. Every mineral element that is present in the cell is needed by cell.

3. Nitrogen as a nutrient is highly immobile in the plants.

4. It is very easy to establish the essentiality of micronutrients, because they are required in traces.

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