E-PolyLearning

6. The heavily polluted zone of water reservoir is known as
a. pleosaprophytic zone
b. mesosaprophytic zone
c. oligosaprophytic zone
d. none of these
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Answer: (a).pleosaprophytic zone

7. Streptomyces griseochromogenes is reported to show a potent curative effect against
a. rice blast disease
b. yellow blight of maize
c. milo of soybean
d. eye spot of sugarcane
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Answer: (a).rice blast disease

8. Which of the following is selectively effective against dicot weeds?
a. Cycloheximide
b. Anisomycin
c. Herbicidin A and B
d. Bialaphos
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Answer: (c).Herbicidin A and B

9. Which of the following/(s) can be used for the reduction of nitrate in waste water?
a. Growth of Hypomicrobium in presence of added methanol
b. Micrococcus denitrificans cells encapsulated in liquid membranes
c. Both (a) and (b)
d. Nitrosomonas europaen
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Answer: (c).Both (a) and (b)

10. Which of the following herbicide is known to be effective against perennial shrubs, annual weeds and weeds of rice?
a. Cycloheximide
b. Anisomycin
c. Herbicidin
d. Bialaphos
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Answer: (a).Cycloheximide

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