Microorganisms are used during which stage of the purification of the sewage water?
(1) Primary treatment
(2) Secondary treatment
(3) Tertiary treatment
(4) Both (1) and (2)
(2) The aerobes are used to consume the organic matter during the secondary stage follwed by anaerobic digestion of the aerobes themselves.
Difficulty Level:
Big holes in Swiss cheese are made by a:
(1) a machine
(2) a bacterium that produces methane gas
(3) a bacterium producing a large amount of carbon dioxide
(4) a fungus that releases a lot of gases during its metabolic activites.
(3) read page 181, XII NCERT
Difficulty Level:
Match the items in column 'A' and Column 'B' and choose correct answer.
|
Column A |
|
Column B |
|
|
(i) |
Lady Bird |
(a) |
Menthano bacterium |
|
(ii) |
Mycorrhiza |
(b) |
Trichoderma |
|
(iii) |
Biological control |
(c) |
Aphids |
|
(iv) |
Biogas |
(d) |
Glomus |
The correct answer is:
(1) (i) - b, (ii) - d, (iii) - c, (iv) - a
(2) (i) - c, (ii) - d, (iii) - b, (iv) - a
(3) (i) - d, (ii) - a, (iii) - b, (iv) - c
(4) (i) - c, (ii) - b, (iii) - a, (iv) - d
(2) Read page 187, XII NCERT
Difficulty Level:
Match the following list of bioactive substances and their roles:
|
|
Bioactive substance |
|
Role |
|
(i) |
Statin |
(a) |
Removal of oil stains |
|
(ii) |
Cyclosporin |
(b) |
Removal of clots from blood vessels |
|
(iii) |
Streptokinase |
(c) |
Lowering of blood cholesterol |
|
(iv) |
Lipase |
(d) |
Immuno-suppressive agent |
Choose the correct match:
(1) (i) - b, (ii) - c, (iii) - a, (iv) - d
(2) (i) - d, (ii) - b, (iii) - a, (iv) - c
(3) (i) - d, (ii) - a, (iii) - d, (iv) - c
(4) (i) - c, (ii) - d, (iii) - b, (iv) - a
(4) Read page 183, XII NCERT
Difficulty Level:
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:
(1) Vitamin C
(2) Vitamin D
(3) Vitamin B12
(4) Vitamin E
(3) Read page 183, XII NCERT
Difficulty Level:
Which one of the following alcoholic drinks is produced without distillation?
(1) Wine
(2) Whisky
(3) Rum
(4) Brandy
(1) Read page 182, XII NCERT
Difficulty Level:
Match the following list of bacteria and their commercially important products:
|
|
Bacterium |
|
Product |
|
(i) |
Aspergullus 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:
(1) (i) - b, (ii) - c, (iii) - d, (iv) - a
(2) (i) - b, (ii) - d, (iii) - c, (iv) - a
(3) (i) - d, (ii) - c, (iii) - b, (iv) - a
(4) (i) - d, (ii) - a, (iii) - c, (iv) - b
(3) Read page 183, XII NCERT
Difficulty Level:
The residue left after methane production from cattle dung is:
(1) burnt
(2) burried in land fills
(3) used as manure
(3) used in civil construction
(3) Read page 185, XII NCERT
Difficulty Level:
BOD of waste water is estimated by measuring the amount of:
(1) total inorganic matter
(2) biodegradable organic matter
(3) oxygen evolution
(4) oxygen consumption.
(4) Read page 184, XII NCERT
Difficulty Level:
The free-living fungus Trichoderma can be used for:
(1) killing insects
(2) biological control of plant diseases
(3) controlling butterfly caterpillars
(4) producing antibiotics
(2) Read page 187, XII NCERT
Difficulty Level: