1. A nitrogen fixing microbe associated with the fern Azolla in rice fields is
(a) Frankia
(b) Rhizobium
(c) Spirulina
(d) Anabaena
2. 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
3. Which of the following is widely used as a successful biofertiliser in Indian rice field!?
(a) Rhizobium
(b) Acacia arabica
(c) Acal ypha indica.
(d) Azol la pinnata
4. Which of the following options incides biofertiilscrs?
(a) cow dung manure and farm yard waste
(b) A quick growing crop ploughed back in to the field
(c) Nostoc, Oscillatoria
(d) All of these
5. Which of the following is a non-symbiotic biofertiiliser?
(a) VAMM
(b) Azotobacter
(c) Analbaena
(d) Rhizobium
6. Nitrogen fixation in root nodules of Alnus is brought about by
(a) Frankia
(b) Azorhizobium
(c) Bradyrhizobium
(d) Clostridium
7. 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
8. Wastewater treatment generates a large quantity of sludge, which can be treated by
(a) anaerobic digesters
(b) floe
(c) chemicals
(d) oxidation pond
9. Methanogenic bacteria are not found in
(a) rumen of cattle
(b) gobar gas plant
(c) bottom of water-logged paddy field
(d) activated sludge
10. The primary treatment of wastewater involves the removal of
(a) dissolved impurities
(b) stable particles
(c) toxic substances
(d) harmful bacteria
11. BOD of wastewater is estimated by measuring the amount of
(a) total organic matter
(b) biodegradable organic matter
(c) oxygen evolution
(d) oxygen consumption
12. Which one of the following alcoholic drinks is produced without distillation?
(a) Wine
(b) Whisky
(c) Rum
(d) Brandy
13. 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
14. 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
15. Which one of the following is not nitrogen-fixing organism?
(a) Anabaena
(b) Nostoc
(c) Azotobacter
(d) Pseudomonas
16. Which of the following microbes is proteinacious infectious agent?
(a) Fungi
(b) Prions
(c) Bacteria
(d) Protozoa
17. The nutritive medium for growing bacteria and many fungi in laboratory called
(a) growth media
(b) suspension media
(c) culture media
(d) colonial media
18. The inoculum is added to the fresh in order to convert milk into curd, term ‘inoculum’ here refers to
18. 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
19. Which of the following organisms is used in the production of beverages?
(a) Penicillium notatum
(b) Saccharomyces cerevisiae
(c) Aspergilus niger
Here are 20 Most Important MCQs On Microbes In Human Welfare for Bsc Nursing for Students Preparing For NEET | ABVMU | CNET | RUHS |