Nitrogen Fixation Objective Type Questions and Answers

Questions

21 The root nodules of legumes contain a pink pigment which has high affinity for oxygen is

A Nod Haemoglobin

B Leghaemoglobin

C Haemoglobin

D Bacterial Haemoglobin

Answer: Leghaemoglobin

22 The process of conversion of soil NO3- to N2 is called

A Nitrification

B Denitrification

C Ammonification

D Nitrogen Fixation

Answer: Denitrification

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23 Dinitrogenase reductase is a

A Monomer

B Dimer

C Trimer

D None of these

Answer: Dimer

24 Dinitrogenase is a

A Tetramer

B Monomer

C Dimer

D Trimer

Answer: Tetramer

25 All the following are free living N2 fixers except

A Azotobacter

B Rhodospirillum

C Clostridium

D Rhizobium

Answer: Rhizobium

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