CHAPTER-10 : MICROBES IN HUMAN WELFARE
Multiple Choice Questions
- Which is incorrect among the given statements?
(a) Hard cheese contains less than 40% water.
(b) Cheese culture consists up of /DFWREDFLOOXV$FHWREDFWHU
6DFFKDURP\FHV5KL]RSXV and $P\ORP\FHV.
(c) Cottage cheese is prepared by double step
fermentation.
(d) Swiss cheese is ripened with the help of CO 2 producing
bacterium called 3URSLRQLEDFWHULXPVKHUPDQLL.
- Brandy contains
(a) 95% alcohol (b) 98% alcohol
(c) 60-70% alcohol (d) 40% alcohol.
- Study the given table and correctly identify P, Q, R and S.
Enzyme Source Function
Pectinase P Retting of fibres
Q 6WUHSWRFRFFXV Fibrinolytic effect
Protease 0RUWLHUHOODUHQLVSRUD R
Lactase S Prevents sandiness
in ice-cream
P Q R S
(a) %\VVRFKODP\VStrepto- Chill proofing 6DFFKDURP\FHV
IXOYR kinase IUDJLOLV
(b) *HRWULFKXP Lipase Softening 5KL]RSXV
FDQGLGXP of bread
(c) $VSHUJLOOXV Amylase Remove 0XFRU
sp. oil stains
(d) 7RUXOD Lipase Clot buster %DFLOOXVsp.
FUHPRULV
- Which acid is obtained through the fermentation carried out
by $VSHUJLOOXVQLJHU and 0XFRU species on sugary syrups?
(a) Acetic acid (b) Citric acid
(c) Lactic acid (d) Butyric acid
- Find out the mismatched pair.
(a) Rennet – 0XFRU
(b) Lactase – 7RUXODFUHPRULV
(c) Pectinase – &DQGLGDOLSRO\WLFD
(d) Amylase – $VSHUJLOOXV
- The common antibiotic obtained from lichen is
(a) patulin (b) usnic acid
(c) citrinin (d) clavacin.
- Spores of %DFLOOXVWKXULQJLHQVLV possess Cry protein which is
(a) fungicidal (b) herbicidal
(c) insecticidal (d) bactericidal.
- A blue-green algae used for production of single cell protein
is
(a) 2VFLOODWRULD (b) )XFXV
(c) 6SLURJ\UD (d) 6SLUXOLQD.
9. Amount of CO 2 in biogas is
(a) 30 - 40% (b) 50 - 60%
(c) 60 - 80% (d) less than 5%.
10. Read the given statements carefully and select the correct
option.
(i) $]RVSLULOOXP bacteria live around the roots of higher
plants without developing any intimate relationship.
(ii) Biofertilisers are not effective under semi-arid conditions.
(iii) Cyanobacteria are extremely low cost biofertilisers.
(iv) Biopesticides are pest specific and are harmless to
other organisms.
(a) (i) and (ii) are correct.
(b) Only (iii) is correct.
(c) (i) and (iii) are incorrect.
(d) Only (ii) is incorrect.
Match The Columns
- Match Column I with Column II.
Column I Column II
A. Tofu (i) Pickled cabbage
B. Sauerkraut (ii) SCP
C. Sour cream (iii) 6WUHSWRFRFFXVWKHUPRSKLOXV
D. Yoghurt (iv) 6WUHSWRFRFFXVODFWLV
E. Yeast (v) Soybean
- Match Column I with Column II. (There can be more than
one match for items in Column I)
Column I Column II
A. $]ROOD (i) Rhizosphere association
B. 5KRGRVSLULOOXP (ii) Symbiotic nitrogen
fixing bacteria
C. $]RVSLULOOXP (iii) Vesicular-arbuscular
mycorrhiza
D. 5KL]RELXP (iv) Associative mutualism
E. *ORPXV (v) Photoautotrophic bacteria
(vi) Arbuscules
(vii) $QDEDHQD
(viii) Free living nitrogen
fixing bacteria
(ix) Leghaemoglobin
(x) Rice plant
Passage Based Question
- Complete the given passage with appropriate words or
phrases.
Fermentative activity of microbes is used industrially
to obtain a number of products. For any new industrial
utilisation of a microbial activity, the technology passes
through three stages –laboratory scale, pilot plant scale
and (i). The development from laboratory scale to
(i) is called (ii). Laboratory scale uses (iii) for fermentation
