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What are the conditions necessary for fixation of atmospheric
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
How are the minerals absorbed by plants?
Q2
What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N fixation?
Q3
What are the steps involved in formation of a root nodule?
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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
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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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Biology (NCERT)

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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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Text SolutionText solutionverified iconVerified

Rhizobium is a symbiotic bacteria present in the root nodules of leguminous plants. The basic requirements for Rhizobium to carry out nitrogen fixation are as follows :
(a) Presence of the enzyme nitrogenase
(b) Presence of leg-haemoglobin
(c) Non-haem iron protein, ferrodoxin as the electron-carrier
(d) Constant supply of ATP
(e) ions as co-factors
Rhizobium contains the enzyme nitrogenase - a Mo-Fe protein - that helps in the conversion of atmospheric free nitrogen into ammonia.
The reaction is as follows :

The Rhizobium bacteria live as aerobes under free-living conditions, but require anaerobic conditions during nitrogen fixation. This is because the enzyme nitrogenase is highly sensitive to molecular oxygen. The nodules contain leg-haemoglobin, which protects nitrogenase from oxygen.
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Question Text
What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N fixation?
TopicMineral Nutrition
SubjectBiology
ClassClass 11
Answer TypeText solution:1
Upvotes45