MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers
Question 1.
Bacillus thuringiensis (Bt) strains have been used for designing novel:
(a) Bio-metallurigcal techniques
(b) Bio-mineralization process
(c) Bio-insecticidal plants
(d) Bio-fertilizers
Answer
Answer: (c) Bio-insecticidal plants
Question 2.
Streptococcus is used in the preparation of:
(a) Wine
(b) Idli
(c) Paneer
(d) Bread
Answer
Answer: (c) Paneer
Question 3.
Nif gene occurs in:
(a) Peiiicillium
(b) Rhizobium
(c) Aspergillus
(d) Streptococcus
Answer
Answer: (b) Rhizobium
Question 4.
Azoila has symbiotic relationship with:
(a) Chlotfila
(b) Anabaena
(c) Nostoc
(d) Tolypothrix
Answer
Answer: (b) Anabaena
Question 5.
Term antibiotic was first used by :
(a) Flemming
(b) Pasteur
(c) Waksman
(d) Lister
Answer
Answer: (c) Waksman
Question 6.
A free living anaerobic nitrogen fixing bacterium is:
(a) Rhizobium
(b) Streptococcus
(c) Azotobactor
(d) Clostridium
Answer
Answer: (d) Clostridium
Question 7.
Citric acid is produced by:
(a) Rhizopus
(b) Mucor
(c) Aspergillus
(d) Saccharomyces
Answer
Answer: (a) Rhizopus
Question 8.
In nostoc, enzyme nitrogenase occurs in :
(a) Vegetative cells
(b) Heterocysts
(c) Both (a) and (b)
(d) Only in hormogones
Answer
Answer: (c) Both (a) and (b)
Question 9.
Usnic acid is an antibiotic obtained from :
(a) Fungi
(b) Bacteria
(c) Lichens
(d) Algae
Answer
Answer: (c) Lichens
Question 10.
By anobacteria are useful biofertilizers in the; field of:
(a) Wheat
(b) Maize
(c) Rice
(d) Sugarcane
Answer
Answer: (c) Rice
Question 11.
Streptomycin is produced by:
(a) By Streptomyces Scoleus
(b) By Streptomyces fradiae
(c) By Streptomyces venezueleae
(d) By Streptomyces griseus
Answer
Answer: (d) By Streptomyces griseus
Question 12.
Antibiotics are:
(a) Medicines
(b) Toxin
(c) Plants
(d) Syrups
Answer
Answer: (a) Medicines
Question 13.
A free-living aerobic and non-photosynthetic nitrogen fixing bacterium is:
(a) Anabaena
(b) Clostridium
(c) Azotobactor
(d) Rhizobium
Answer
Answer: (c) Azotobactor
Question 14.
For retting of jute, the fermenting microbe is:
(a) Methanophilic bacteria
(b) Butyric acid bacteria
(c) Helicobactor pylon
(d) Streptococcus lactin
Answer
Answer: (b) Butyric acid bacteria
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