51. Conversion of molecular nitrogen into ammonia by free living organism is called __________ nitrogen fixation.
A. atmospheric.
B. industrial.
C. nonsymbiotic.
D. symbiotic.
ANSWER: C
52. Non symbiotic nitrogen fixers are _______.
A. bacteria.
B. virus.
C. fungi.
D. nematodes.
ANSWER: A
53. Non symbiotic nitrogen fixing bacterium is _______.
A. Anabena.
B. Azomonas.
C. Rhizobium.
D. Klebsiella.
ANSWER: B
54. Non symbiotic nitrogen fixing cyanobacterium is _______.
A. Anabena.
B. Azomonas.
C. Rhizobium.
D. Klebsiella.
ANSWER: A
55. Heterocyst is the structure present in _______.
A. Anabena.
B. Azomonas.
C. Rhizobium.
D. Azospirillum.
ANSWER: B
56. What is the shape of root nodules?
A. Spherical.
B. Circular.
C. Oval.
D. Rectangle.
ANSWER: A
57. Root nodule is formed by the _________ of the root cells.
A. elongation.
B. circularization.
C. curling.
D. proliferation.
ANSWER: D
58. Proliferation of root nodule is induced by the bacterium _______.
A. Anabena.
B. Azomonas.
C. Rhizobium.
D. Azospirillum.
ANSWER: C
59. Fe-protein part of nitrogenase enzyme can also be called as _______.
A. dinitrogen reductase.
B. dinitrogenase.
C. reductase.
D. dinitrogen.
ANSWER: B
60. Fe-Mo-protein part of nitrogenase enzyme can also be called as _______.
A. dinitrogen reductase.
B. dinitrogenase.
C. reductase.
D. dinitrogen.
ANSWER: A
