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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?

The appearance of the deficiency depends on the mobility of the element in plants. Therfore in certain plants the deficiency appears in the younger parts while in other in the mature plants.
If the element is mobile, then the deficiency appears in the older tissues first as the biomolecules in the older tissue are broken down to release the element which is then transported to the young tissues. For example, nitrogen being a mobile, its deficiency appear in senescent or older leaves.
If the element is immobile then the deficiency first appears in the young parts as the these are not transported from the older tissues. Deficiency of the immmobile element calcium is first seen in young parts.

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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.

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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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