Nitrogen Fixation Quiz | Nitrogen Fixation Objective Type Questions and Answers

(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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