What are the steps involved in formation of root nodule
Steps of root nodules :
(1) Rhizobium bacteria makes contact with a susceptible root hair and divide near it.
(2) After successful infection of the root hair causes the root hair curls,
(3) Infected thread carries the bacteria to the inner cortex. The bacteria modifies into rod-shaped bacteroids and cause inner cortical and pericycle cells to divide. Division and growth of cortical and pericycle cells lead to the nodule formation,
(4) A mature nodule forms with vascular tissues continuous with those of the root.
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.
