Class 11 Biology - Chapter Mineral Nutirtion NCERT Solutions | What are the steps involved in formation
What are the steps involved in formation of a root nodule?
Multiple interactions are involved in the formation of root nodules:
1) The Rhizobium bacteria divide and form colonies. These get attached to the root hairs and epidermal cells.
2) The root hairs get curled and are invaded by the bacteria.
3) This invasion is followed by the formation of an infection thread that carries the bacteria into the cortex of the root. The bacteria get modified into rod-shaped bacteroides.
4) As a result, the cells in the cortex and pericycle undergo division, leading to the formation of root nodules.
5) The nodules finally get connected with the vascular tissues of the roots for nutrient exchange.
More Questions From Class 11 Biology - Chapter Mineral Nutirtion
- Q:- Explain with examples: macronutrients, micronutrients, beneficial nutrients, toxic elements and essential elements.
- Q:- Why is purification of water and nutrient salts so important in studies involving mineral nutrition using hydroponics?
- Q:- All elements that are present in a plant need not be essential to its survival. Comment.
- Q:- Which of the following statements are true? If false, correct them:
(a) Boron deficiency leads to stout axis.
(b) Every mineral element that is present in a cell is needed by the cell.
(c) Nitrogen as a nutrient element, is highly immobile in the plants.
(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities. - Q:- What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 -fixation?
- Q:- How are the minerals absorbed by the plants?
- Q:- Name at least five different deficiency symptoms in plants. Describe them and correlate them with the concerned mineral deficiency.
- Q:- 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?
- Q:- If a plant shows a symptom which could develop due to deficiency of more than one nutrient, how would you find out experimentally, the real deficient mineral element?
Popular Questions of Class 11 Biology
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- Q:-
Which of the following is not correct?
(a) Robert Brown discovered the cell.
(b) Schleiden and Schwann formulated the cell theory.
(c) Virchow explained that cells are formed from pre-existing cells.
(d) A unicellular organism carries out its life activities within a single cell. - Q:- What are macromolecules? Give examples.
- Q:- What is the average cell cycle span for a mammalian cell?
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10 Comment(s) on this Question
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Aur thoda diagram ke sath explains kijiye na
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