Biology Multiple Choice Questions and Answers for Different Competitive Exams

MCQ on Agricultural Microbiology

1. Rhizobium has symbiotic association with
a) legumes
b) non-legume crops
c) sugarcane
d) paddy
2. All are free living nitrogen fixers except
a) Azospirillum
b) Clostridium
c) Azotobacter
d) Bacillus polymyxa
3. Anabaena, a nitrogen fixer is present in the root pockets of
a) Salvinia
b) Marselia
c) Azolla
d) Pistia
4. The advantage of plants in mycorrhizal association is
a) food
b) protection
c) increased mineral absorption and disease protection
d) all of these
5. Azolla is widely used as nitrogen fixer in


Azolla
Azolla
a) paddy fields
b) corn fields
c) maize fields
d) all of the above
6. Which of the following is N2 fixing bacteria associated with roots of C4 plants like maize, sugarcane
a) Azospirillum
b) Clostridium
c) Azotobacter
d) Bacillus polymyxa
7. Which of the following is N2 fixing bacterium living in association with sugarcane
a) Acetobacter
b) Azotobacter
c) Frankia
d) Azospirillum
8. Microbes that solubilize fixed soil phosphorous are called
a) Phosphorous fixers (PF)
b) phosphorous solubilising microorganisms (PSM)
c) Phosphorous solubilisers (PS)
d) none of these
9. The major advantage of a plant with VAM is
a) increased N2 absorption
b) increased P absorption
c) increased K absorption
d) increased Mn absorption
10. Which of the following is a N2 fixing actinomycete
a) Acetobacter
b) Azotobacter
c) Frankia
d) Azospirillum
11. Epizootics are
a) animals pathogenic to insects
b) microbes pathogenic to insects
c) protists pathogenic to insects
d) viruses pathogenic to insects
12. The endomycorrhizal association is present in
a) 10% of plant families
b) 40% of plant families
c) 85% of plant families
d) less than 5% of plant families
13. Which of the following is used as fungal pesticide against Colorado beetle
a) Beauveria bassiana
b) Fusarium sp
c) Aspergillus niger
d) Alternaria sp
14. Bacillus thuringiensis produce
a) insecticidal protein
b) nematocidal protein
c) fungicidal protein
d) all of these
15. Which of the following fungus is a nematophagous fungi
a) Beauveria bassiana
b) Fusarium sp
c) Arthrobotrys oligospora
d) Alternaria sp
Answers
1. a) legumes
2. a) Azospirillum
3. c) Azolla
4. c) increased mineral absorption and disease protection
5. a) paddy fields
6. a) Azospirillum
7. a) Acetobacter
8. b) phosphorous solubilising microorganisms (PSM)
9. b) increased P absorption
10. c) Frankia
11. d) viruses pathogenic to insects
12. c) 85% of plant families
13. a) Beauveria bassiana
14. a) insecticidal protein
15. c) Arthrobotrys oligospora
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