- Identify the correctly matched pair.
(a) Free living N 2 fixing bacteria - Rhizobium
(b) Free living N 2 fixing cyanobacteria - Azotobacter
(c) Symbiotic nitrogen fixing cyanobacteria - Anabaena
(d) Mycorrhiza - Xanthomonas - Read the given statements carefully.
(i) Toddy is made by fermentation of sap of palms.
(ii) Lactic acid is used in pharmaceutical preparations.
(iii) Gluconic acid causes partial digestion of milk protein
casein.
(iv) Brandy having high alcohol content is obtained without
distillation of fermented broth.
Choose the correct statements.
(a) (i) and (ii) (b) (ii) and (iii)
(c) (i), (iii) and (iv) (d) (ii) and (iv) - Study the given table and identify A, B and C.
A Aspergillus Clearing beer and whisky
Lipases Candida
lipolyticaBAmylases C Softening of breadA B C
(a) Lactases Removing oily stains Bacillus
(b) Proteases Flavouring cheese Rhizopus
(c) Proteases Coagulation of milk Streptococcus
protein
(d) Pectinases Preparation of green Aspergillus
coffee- Fern present in rice field having symbiotic association with
Anabaena is
(a) Azolla (b) Casuarina
(c) Alnus (d) Ardisia. - Manufacturing of which organic acid requires zymase?
(a) Citric acid (b) Gluconic acid
(c) Acetic acid (d) Butyric acid - Select an option that correctly fills the banks.
(i) Extract obtained from calf’s stomach is .
(ii) Inoculum used for preparing milk products
contains.
(iii) _____ is facultative anaerobic decomposer microbe.
(i) (ii) (iii)
(a) rennin Streptomyces Aspergillus
(b) caesin Streptococcus Rhizopus
(c) zymase Aspergillus Candida
(d) rennet Lactobacillus Clostridium - Identify constituents of marsh gas.
(a) CH4, CO 2 and H 2 O
(b) CH 4 , CO 2 and H 2 S
(c) CH 4 , CO and N 2
(d) CH 4 , H 2 and O 2
17. Statement A - Pseudomonas breaksdown complex
organic compounds into simpler substances during biogas
generation.
Statement B - Pseudomonas catalyses solubilisation step
of anaerobic digestion of organic waste.
(a) Both statements A and B are correct and B is the correct
explanation of A.
(b) Both statements A and B are correct but B is not the
correct explanation of A.
(c) Statement A is correct but B is incorrect.
(d) Both statements A and B are incorrect.
18. Identify the organic acid obtained from yeast Candida
lipolytica, which is used in flavouring and preservation of
food and candies.
(a) Acetic acid (b) Citric acid
(c) Gluconic acid (d) Butyric acid
19. Which of the following statements are true (T) or false (F)?
(i) Antibiotics are effective against all pathogens.
(ii) Antibiotics are harmless to normal microflora of
alimentary canal.
(iii) Antibiotics are used as feed supplement for animals.
(i) (ii) (iii)
(a) T F T
(b) T T F
(c) F T F
(d) F T T
20. Who commercially extracted the antibiotic penicillin?
(a) Chain and Florey
(b) Flemming
(c) Flemming, Chain and Florey
(d) Waksman and Albert
21. Substance used for lowering blood cholesterol is obtained
from
(a) Saccharomyces (b) Streptococcus
(c) Monascus (d) Trichoderma.
22. Which of the following constituents of organic waste cannot
be broken down under anaerobic conditions?
(a) Cellulose (b) Lignin
(c) Lipids (d) Hemicellulose
23. Identify the products obtained by fermentation of bacteria.
(a) Dosa, acetic acid and cheese
(b) Toddy and neomycin
(c) Buttermilk, beer and antibiotics
(d) Ripened cheese and citric acid- (d) 2. (c) 3. (b) 4. (d) 5. (b)
- (b) 7. (d) 8. (c) 9. (b) 10. (a)
- (c) 12. (b) 13. (b) 14. (c) 15. (a)
- (c) 17. (a) 18. (a) 19. (b) 20. (d)
- (d) 22. (b) 23. (c) 24. (b) 25. (b)
- (b) 27. (d) 28. (d) 29. (c) 30. (b)
- (b) 32. (a) 33. (a) 34. (b) 35. (b)
- (d) 37. (c) 38. (b) 39. (a) 40. (c)
MPP-4 CLASS XII ANSWER KEY