During biological nitrogen fixation, inactivation of nitrogenase by oxygen poisoning is prevented by

1. Leghaemoglobin

2. Xanthophylls

3. Carotene

4. Cytochrome

Subtopic:  Nodule formation |
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Which of the following enzyme is not operational in Rhizobium during free-living conditions?

1. Aldolase

2. Nitrogenase

3. Enolase

4. Mutase

Subtopic:  Nodule formation |
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The function of leghaemoglobin in the root nodules of legumes is 

(1) oxygen removal

(2) nodule differentiation

(3) expression of nif gene

(4) inhibition of nitrogenase activity

Subtopic:  Nitrogen Fixation | Nodule formation |
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The function of leghemoglobin in the root nodules of legumes is

1. oxygen removal
2. nodule differentiation
3. expression of nif gene
4. inhibition of nitrogenase activity

Subtopic:  Nodule formation |
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Reaction of N2 fixation process is depicted below

N2+A+B+16 ATP2NH3+C+16ADP+16 Pi

Select the correct set of A,B and C

1. A = 8e-, B=8H+; C = H2

2.  A = H2, B=8e-; C = 8H+

3. A = 8e-, B=H2; C = 8H+

4. A = 8H+, B=H2; C = 8e-

Subtopic:  Nodule formation |
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The reduction of one molecule of atmospheric nitrogen (N2) into two molecules of ammonia by nitrogenase enzyme requires

1. 4e, 4H+, and 8ATP

2. 4e, 4H+, and 16ATP

3. 8e, 8H+, and 8ATP

4. 8e, 8H+, and 16ATP

Subtopic:  Nodule formation |
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For its action, nitrogenase requires :
1.  Light
2.  Mn2+
3.  Super oxygen radicals
4.  High input of energy

Subtopic:  Nodule formation |
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Read the following statement & select the correct sequence of steps during symbiotic nitrogen fixation?

(a) interaction between Rhizobium & leguminous plant 

(b) Root nodule formation 

(c) Formation of ammonia

(d) leghaemoglobin

(e) Amino acid synthesis

1. a b c e d

2. b ad e c

3. a bc d e

4. a b d c e

Subtopic:  Nitrogen Fixation | Nodule formation |
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Roots of which plant contains a pink pigment which have affinity for oxygen :
1.  Carrot
2.  Soyabean
3.  Mustard
4.  Radish

Subtopic:  Nodule formation |
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Leghaemoglobin is produced in response to

1. respiration 

2. photosynthesis

3. fatty acid synthesis

4. N2 fixation.

Subtopic:  Nodule formation | Nitrogen Metabolism: 1 | Nitrogen metabolism |
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