What are the conditions necessary for fi | Class 11 Biology Chapter Mineral Nutirtion, Mineral Nutirtion NCERT Solutions

Question: What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their role in N2 -fixation?
Answer:

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) Mg2+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:

N2 + 8e– + 8H+ + 16 ATP→ 2 NH3 + H2 + 16ADP + 16Pi

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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Comments

  • Sushant
  • 2019-12-29 20:34:26

Too long...make short


  • Lokesh reddy
  • 2019-10-09 23:33:53

Nice


  • Niharika gujjar
  • 2019-08-12 17:06:11

Too long


  • Yuuuu
  • 2019-07-07 12:45:16

Shut up


  • Raju
  • 2019-03-15 16:54:48

😠😠


  • Karan
  • 2019-03-07 23:26:40

Easy to understand


  • mohit
  • 2015-12-16 19:31:26

nice


Comment(s) on this Question

Welcome to the NCERT Solutions for Class 11 Biology - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 8: What are the conditions necessary for fixation of atmospheric nitrogen by Rhizobium. What is their r....