Agriculture Microbiology MCQ tribhuvan University 8

71. siderophores are
a. high affinity iron chelating compound b. those which transport iron into bacterial cell c. none d. both
72. application of the ammonium containing fertilizers………..
a. suppress the bacterial community b. increases fungal population
c. both of the above d. none of the above
73. phyllospheric organisms does not take part in
a. mineralization b. fertilizer effect c. growth hormone production d. all
74. heterocysts are
a. specialized nitrogen fixing cells b. formed by cyanobacteria c. formed during nitrogen starvation d. all of the above
75. ….. soil is considered ideal for gardening and agricultural purposes.
a. loam soil b. clay soil c. sand soil d. silt soil
76. Azotobacter is
a. cyst forming bacteria b. does not produce spores c. strict aerobe
d. all of the above
77. diazotrophs are
a. organisms capable of nitrogen fixation b. organisms such as rhizobia, frankia, azospirillium c both of the above d. none of the above
78. which of the following horizon is dominant reservoir of Microbial food
a. A b. B c. C d. O
79. …………. Is also known as fat of the land.
a. clay soil b. Humus c. triglycerides d. lignin
80. Humus………….
a. consists of partially decomposed organic matter
b. dominant food reservoir
c. also called fat of the land
d. all of the above