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

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NCERT MCQ Chapters for Class 12 Biology


Q1. Tissue plasminogen activator is

(A) An enzyme
(B) A chemical that stimulates tissue differentiation
(C) Amino acid
(D) A Vitamin


(A) An enzyme


Q2. Which of the following is a non-symbiotic biofertiliser ?

(A) VAM
(B) Azotobacter
(C) Anabaena
(D) Rhizobium


(B) Azotobacter


Q3. Which of the following microbes is a proteinacious infectious agent ?

(A) Fungi
(B) Prions
(C) Bacteria
(D) Protozoa


(B) Prions


Q4. Humulin is a

(A) Vitamin
(B) Fat
(C) Protein
(D) Carbohydrates


(C) Protein


Q5. Antibiotics are:

(A) Medicines
(B) Toxin
(C) Plants
(D) Syrups


(A) Medicines


Q6. The primary treatment of waste water involves the removal of

(A) dissolved impurities
(B) stable particles
(C) toxic substances
(D) harmful bacteria.


(B) stable particles


Q7. Which of the followings is mainly produced by the activity of anaerobic bacteria on sewage?

(A) Mustard gas
(B) Propane
(C) Laughing gas
(D) Marsh gas


(D) Marsh gas


Q8. Methanogenic bacteria are not found in:

(A) rumen of cattle
(B) gobar gas plant
(C) bottom of water logged paddy fields
(D) activated sludge.


(D) activated sludge.


Q9. Which one of the following is not a nitrogen-fixing organism ?

(A) Anabaena
(B) Nostoc
(C) Azotobacter
(D) Pseudomonas


(D) Pseudomonas


Q10. Term antibiotic was first used by :

(A) Flemming
(B) Pasteur
(C) Waksman
(D) Lister


(C) Waksman


Q11. By anobacteria are useful biofertilizers in the; field of:

(A) Wheat
(B) Maize
(C) Rice
(D) Sugarcane


(C) Rice


Q12. 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


(C) Nostoc, Oscillatoria


Q13. The residue left after methane production from cattle dung is:

(A) burnt
(B) buried in land-fills
(C) used as manure
(D) used in civil construction.


(C) used as manure


Q14. The technology of biogas production was developed in India mainly due to the efforts of?

(A) ICRI and KVIC
(B) IARI and KVIC
(C) Pusa Agriculture
(D) None of the above


(B) IARI and KVIC


Q15. Cyanobacteria are used as biofertilisers because they

(A) are photosynthetic
(B) grow easily anywhere
(C) have mucilage
(D) fix atmospheric nitrogen


(D) fix atmospheric nitrogen


Q16. Bacillus thuringiensis is used to control

(A) fungal pathogens
(B) nematodes
(C) bacterial pathogens
(D) insect pests.


(A) fungal pathogens


Q17. The puffed-up appearance of dough is due to production of?

(A) SO2 gas
(B) CO2 gas
(C) Water vapour
(D) O2 gas


(B) CO2 gas


Q18. 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.


(C) Vitamin B12


Q19. 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


(D) increasing its resistance to insects


Q20. Azoila has symbiotic relationship with:

(A) Chlotfila
(B) Anabaena
(C) Nostoc
(D) Tolypothrix


(B) Anabaena


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