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NCERT Solutions for Class 12 Biology Chapter 10
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NCERT Solutions for Class 12 Biology Chapter 10
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UM NIT II:
UNIT II: SSTRUCTURAL
ICROBES TRUCTURAL O
IN HUMAN W
ORGANISATION IN P
RGANISATION IN
ELFARE PLANTS AND A
LANTS AND ANIMAL
NIMALS 69
CHAPTER 10
MICROBES IN HUMAN WELFARE
MULTIPLE-CHOICE QUESTIONS
1. 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.
2. Wastewater treatment generates a large quantity of sludge, which can
be treated by:
a. digesters
b. activated sludge
c. chemicals
d. oxidation pond.
3. Methanogenic bacteria are not found in:
a. rumen of cattle
b. gobar gas plant
c. bottom of water-logged paddy fields
d. activated sludge.
4. Match the following list of bacteria and their commercially important
products:
Bacterium Product
(i) Aspergillus niger (a) Lactic acid
(ii) Acetobacter aceti (b) Butyric acid
(iii) Clostridium butylicum (c) Acetic acid
(iv) Lactobacillus (d) Citric acid
Choose the correct match:
a. i b, ii c, iii d, iv a
b. i b, ii d, iii c, iv a
, 70 BIOLOGY, EXEMPLAR PROBLEMS
c. i d, ii c, iii b, iv a
d. i d, ii a, iii c, iv b
5. Match the following list of bioactive substances and their roles:
Bioactive Substance Role
(i) Statin (a) Removal of oil stains
(ii) Cyclosporin A (b) Removal of clots from blood vessels
(iii) Streptokinase (c) Lowering of blood cholesterol
(iv) Lipase (d) Immuno-suppressive agent
Choose the correct match:
a. i b, ii c, iii a, iv d
b. i d, ii b, iii a, iv c
c. i d, ii a, iii d, iv c
d. i c, ii d, iii b, iv a
6. The primary treatment of waste water involves the removal of:
a. dissolved impurities
b. stable particles
c. toxic substances
d. harmful bacteria.
7. BOD of waste water is estimated by measuring the amount of:
a. total organic matter
b. biodegradable organic matter
c. oxygen evolution
d. oxygen consumption.
8. Which one of the following alcoholic drinks is produced without distillation?
a. Wine
b. Whisky
c. Rum
d. Brandy
9. The technology of biogas production from cow dung was developed in
India largely due to the efforts of:
a. Gas Authority of India
b. Oil and Natural Gas Commission
c. Indian Agricultural Research Institute and Khadi & Village
Industries Commission
d. Indian Oil Corporation.
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