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What are the steps involved in formation of a root nodule?
Biology
Biology

Class 11

NCERT

Publisher:
NCERT
Subject:
Biology
1

Chapter 1: The Living World

11 questions

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2

Chapter 2: Biological Classification

12 questions

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3

Chapter 3: Plant Kingdom

12 questions

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4

Chapter 4: Animal Kingdom

15 questions

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5

Chapter 5: Morphology of Flowering Plants

15 questions

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6

Chapter 6: Anatomy of Flowering Plants

12 questions

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7

Chapter 7: Structural Organization in Animals

14 questions

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8

Chapter 8: Cell: The Unit of Life

14 questions

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9

Chapter 9: Biomolecules

15 questions

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10

Chapter 10: Cell Cycle and Cell Division

16 questions

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11

Chapter 11: Transport in Plants

16 questions

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12

Chapter 12: Mineral Nutrition

10 questions

Q1
What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N fixation?
Q2
What are the steps involved in formation of a root nodule?
Q3
Which of the following statements are true? If false, correct them.
(a) Boron deficiency leads to the 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 plants.
(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.
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13

Chapter 13: Photosysnthesis in Higher Plants

9 questions

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14

Chapter 14: Respiration in Plants

12 questions

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15

Chapter 15: Plant Growth and Development

11 questions

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16

Chapter 16: Digestion and Absorption

15 questions

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17

Chapter 17: Breathing and Exchange of Gases

14 questions

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18

Chapter 18: Body Fluids and Circulation

14 questions

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19

Chapter 19: Excretory Products and their Elimination

12 questions

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20

Chapter 20: Locomotion and Movement

10 questions

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21

Chapter 21: Neural Control and Coordination

12 questions

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22

Chapter 22: Chemical Coordination and Integration

9 questions

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Question
Easy
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Solving time: 3 mins

What are the steps involved in formation of a root nodule?

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Updated on: Feb 26, 2024

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Text SolutionText solutionverified iconVerified

  • Root nodules are found in plants belonging to the family Fabaceae or Leguminosae.
  • They include leguminous plants like beans, peas, peanuts etc.
  • It is formed due to the symbiotic association between the leguminous plant and the host-specific bacteria called the rhizobium.
  • The steps involved in root nodule formation are- 
1) Rhizobium bacteria divides to form colonies which surround the root hairs and epidermal cells of the plant.
2) The root hair gets curled and get invaded by the bacteria.
3) After the invasion, it forms an infection thread that carries the bacteria into the cortex of the root. 
  • Later the bacteria gets modified into rod-shaped bacteria called bacteroids.
4) As a result, the cells in the cortex and pericycle undergo cell division, which forms the root nodules.
5) These root nodules get connected with the vascular tissues of the roots for nutrient exchange and help in nitrogen fixation.
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What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N fixation?
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(d) It is very easy to establish the essentiality of micronutrients because they are required only in trace quantities.
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Question Text
What are the steps involved in formation of a root nodule?
Updated OnFeb 26, 2024
TopicMineral Nutrition
SubjectBiology
ClassClass 11
Answer TypeText solution:1 Video solution: 2
Upvotes268
Avg. Video Duration6 min