Long Answer TypeNodulation : It is the process of formation of nodules. It can be described in in following points.
1. Rhizobiua multiply and colonise the surroundings of roots and get attached to the epidermal and root hair cells.
2. The root hairs curl and bacteria invede it.
3. An infection thread is produced that carries the bacteria to the cortex of the root.
4. Bacteria is then released into the cells and this leads to the differentiation of specialised nitrogen fixing cells.
5. The nodule establishes a direct vascular connection with the root for exchange of nutrients.
Short Answer TypeLong Answer TypeWhy is that in certain plants deficiency symptoms appear first in younger parts of the plant while in others they do so in mature organs?
Short Answer TypeLong Answer TypeShort Answer TypeWhich 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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