MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers

MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers Set-A 

MCQ Questions for Class12 Biology Chapter 10 Microbes in Human Welfare

Microbes in Human Welfare Class 12 Biology MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Biology Chapter 10 Microbes in Human Welfare with Answers Pdf free download. MCQ Questions for Class 12 Biology with Answers were prepared based on the latest exam pattern. We have Provided Microbes in Human Welfare Class 12 Biology MCQs Questions with Answers to help students understand the concept very well.

Class 12 Biology Chapter 10 Quiz

Class 12 Biology Chapter 10 MCQ Online Test


You can refer to NCERT Solutions for Class 12 Biology Chapter 10 Microbes in Human Welfare to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Microbes in Human Welfare Class 12 Biology MCQ online test

Q1. A nitrogen fixing microbe associated with the fern Azolla in rice fields is
A.Frankia
B.Rhizobium
C.Spirulina
D.Anabaena
Ans: Anabaena
Q2. Azolla pinnata has been found to be an important biofertiliser for paddy crops. This quality is due to the presence of
A.N2 fixing bacteria
B.N2 fixing cyanobacteria
C.mycorrhizae
D.all of these
Ans: N2 fixing cyanobacteria
Q3. Which of the following is widely used as a successful biofertiliser in Indian rice field ?
A.Rhizobium
B.Acacia arabica
C.Acalypha indica
D.Azolla pinnata
Ans: Azolla pinnata
Q4. Which of the following options incldes biofertilscrs ?
A.cowdung manure and farmyard waste
B.A quick growing crop ploughed back into the field
C.Nostoc, Oscillatoria
D.All of these
Ans: Nostoc, Oscillatoria
Q5. Which of the following is a non-symbiotic biofertiliser ?
A.VAM
B.Azotobacter
C.Anabaena
D.Rhizobium
Ans: Azotobacter
Q6. Nitrogen fixation in root nodules of Alnus is brought about by
A.Frankia
B.Azorhizobium
C.Bradyrhizobium
D.Clostridium
Ans: Frankia
Q7. The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is
A.vitamin C
B.vitamin D
C.vitamin B12
D.vitamin E
Ans: vitamin B12
Q8. Wastewater treatment generates a large quantity of sludge, which can be treated by
A.anaerobic digesters
B.floe
C.chemicals
D.oxidation pond
Ans: anaerobic digesters
Q9. Methanogenic bacteria are not found in
A.rumen of cattle
B.gobar gas plant
C.bottom of water-logged paddy field
D.activated sludge
Ans: activated sludge
Q10. The primary treatment of wastewater involves the removal of
A.dissolved impurities
B.stable particles
C.toxic substances
D.harmful bacteria
Ans: stable particles
Q11. BOD of wastewater is estimated by measuring the amount of
A.total organic matter
B.biodegradable organic matter
C.oxygen evolution
D.oxygen consumption
Ans: oxygen consumption
Q12. Which one of the following alcoholic drinks is produced without distillation ?
A.Wine
B.Whisky
C.Rum
D.Brandy
Ans: Wine
Q13. The free-living fungus Trichoderma can be used for
A.killing insects
B.biological control of plant diseases
C.controlling butterfly caterpillars
D.producing antibiotics
Ans: biological control of plant diseases
Q14. Mycorrhiza does not help the host plant in
A.enhancing its phosphorus uptake capacity
B.increasing its tolerance to drought
C.enhancing its resistance to root pathogens
D.increasing its resistance to insects
Ans: increasing its resistance to insects
Q15. Which one of the following is not a nitrogen-fixing organism ?
A.Anabaena
B.Nostoc
C.Azotobacter
D.Pseudomonas
Ans: Pseudomonas
Q16. Which of the following microbes is a proteinacious infectious agent ?
A.Fungi
B.Prions
C.Bacteria
D.Protozoa
Ans: Prions
Q17. The nutritive medium for growing bacteria and many fungi in laboratory is called
A.growth media
B.suspension media
C.culture media
D.colonial media
Ans: culture media
Q18. The inoculum is added to the fresh milk in order to convert milk into curd, the term ‘inoculum’ here refers to
A.a starter rich in vitami Bp
B.a starter rich in proteins
C.a starter containing milions of LAB
D.an aerobic digester
Ans: a starter containing milions of LAB
Q19. Which of the following organisms is used in the production of beverages ?
A.Penicillium notatum
B.Saccharomyces cerevisiae
C.Aspergilus niger
D.Clostridium butylicum
Ans: Saccharomyces cerevisiae
Q20. Which of the following options contains the end products formed during anaerobic respiration in yeast ?
A.H2O, CO2 and energy
B.H2S, C6H12O6 and energy
C.CO2, C2H5OH and energy
D.H2O and CO2
Ans: CO2, C2H5OH and energy

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