Friday, 29 January 2021

CBSE Class 12 Biology - MCQ and Online Tests - Unit 10 - Microbes in Human Welfare

CBSE Class 12 Biology – MCQ and Online Tests – Unit 10 – Microbes in Human Welfare

Every year CBSE conducts board exams for 12th standard. These exams are very competitive to all the students. So our website provides online tests for all the 12th subjects. These tests are also very effective and useful for those who preparing for competitive exams like NEET, JEE, CA etc. It can boost their preparation level and confidence level by attempting these chapter wise online tests.

These online tests are based on latest CBSE Class 12 syllabus. While attempting these our students can identify the weak lessons and continuously practice those lessons for attaining high marks. It also helps to revise the NCERT textbooks thoroughly.


CBSE Class 12 Biology – MCQ and Online Tests – Unit 10 – Microbes in Human Welfare

Question 1.
Usnic acid is an antibiotic obtained from :
(a) Fungi
(b) Bacteria
(c) Lichens
(d) Algae


Answer: (c) Lichens

Question 2.
By anobacteria are useful biofertilizers in the; field of:
(a) Wheat
(b) Maize
(c) Rice
(d) Sugarcane


Answer: (c) Rice

Question 3.
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: (c) Bio-insecticidal plants

Question 4.
Term antibiotic was first used by :
(a) Flemming
(b) Pasteur
(c) Waksman
(d) Lister


Answer: (c) Waksman

Question 5.
Citric acid is produced by:
(a) Rhizopus
(b) Mucor
(c) Aspergillus
(d) Saccharomyces


Answer: (a) Rhizopus

Question 6.
Streptomycin is produced by:
(a) By Streptomyces Scoleus
(b) By Streptomyces fradiae
(c) By Streptomyces venezueleae
(d) By Streptomyces griseus


Answer: (d) By Streptomyces griseus

Question 7.
For retting of jute, the fermenting microbe is:
(a) Methanophilic bacteria
(b) Butyric acid bacteria
(c) Helicobactor pylon
(d) Streptococcus lactin


Answer: (b) Butyric acid bacteria

Question 8.
Antibiotics are:
(a) Medicines
(b) Toxin
(c) Plants
(d) Syrups


Answer: (a) Medicines

Question 9.
A free living anaerobic nitrogen fixing bacterium is:
(a) Rhizobium
(b) Streptococcus
(c) Azotobactor
(d) Clostridium


Answer: (d) Clostridium

Question 10.
Azoila has symbiotic relationship with:
(a) Chlotfila
(b) Anabaena
(c) Nostoc
(d) Tolypothrix


Answer: (b) Anabaena

Question 11.
In nostoc, enzyme nitrogenase occurs in :
(a) Vegetative cells
(b) Heterocysts
(c) Both (a) and (b)
(d) Only in hormogones


Answer: (c) Both (a) and (b)

Question 12.
A free-living aerobic and non-photosynthetic nitrogen fixing bacterium is:
(a) Anabaena
(b) Clostridium
(c) Azotobactor
(d) Rhizobium


Answer: (c) Azotobactor

Question 13.
Streptococcus is used in the preparation of:
(a) Wine
(b) Idli
(c) Paneer
(d) Bread


Answer: (c) Paneer

Question 14.
Nif gene occurs in:
(a) Peiiicillium
(b) Rhizobium
(c) Aspergillus
(d) Streptococcus


Answer: (b) Rhizobium




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