Microbes in Human Welfare NCERT Based Test Paper by TEACHING CARE online tuition and coaching classes.
- The vitamin whose content increases following the conversion of milk
into curd by lactic acid bacteria is:
- vitamin C
- vitamin D
- vitamin B12
- vitamin E.
- Wastewater treatment generates a large quantity of sludge, which can
be treated by:
- digesters
- activated sludge
- chemicals
- oxidation pond.
- Methanogenic bacteria are not found in:
- rumen of cattle
- gobar gas plant
- bottom of water-logged paddy fields
- activated sludge.
- 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:
- i b, ii c, iii d, iv a
- i b, ii d, iii c, iv a
- i d, ii c, iii b, iv a
- i d, ii a, iii c, iv b
- 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:
- i b, ii c, iii a, iv d
- i d, ii b, iii a, iv c
- i d, ii a, iii d, iv c
- i c, ii d, iii b, iv a
- The primary treatment of waste water involves the removal of:
- dissolved impurities
- stable particles
- toxic substances
- harmful bacteria.
- BOD of waste water is estimated by measuring the amount of:
- total organic matter
- biodegradable organic matter
- oxygen evolution
- oxygen consumption.
- Which one of the following alcoholic drinks is produced without distillation?
- Wine
- Whisky
- Rum
- Brandy
- The technology of biogas production from cow dung was developed in
India largely due to the efforts of:
- Gas Authority of India
- Oil and Natural Gas Commission
- Indian Agricultural Research Institute and Khadi & Village
Industries Commission
- Indian Oil Corporation.
- The free-living fungus Trichoderma can be used for:
- killing insects
- biological control of plant diseases
- controlling butterfly caterpillars
- producing antibiotics
- What would happen if oxygen availability to activated sludge flocs is
reduced?
- It will slow down the rate of degradation of organic matter
- The center of flocs will become anoxic, which would cause death
of bacteria and eventually breakage of flocs.
- Flocs would increase in size as anaerobic bacteria would grow
around flocs.
- Protozoa would grow in large numbers.
- Mycorrhiza does not help the host plant in:
- Enhancing its phosphorus uptake capacity
- Increasing its tolerance to drought
- Enhancing its resistance to root pathogens
- Increasing its resistance to insects.
- Which one of the following is not a nitrogen-fixing organism?
- Anabaena
- Nostoc
- Azotobacter
- Pseudomonas
- Big holes in Swiss cheese are made by a:
- a machine
- a bacterium that produces methane gas
- a bacterium producing a large amount of carbon dioxide
- a fungus that releases a lot of gases during its metabolic activities.
- The residue left after methane production from cattle dung is:
- burnt
- burried in land fills
- used as manure
- used in civil construction.
- Methanogens do not produce:
- oxygen
- methane
- hydrogen sulfide
- carbon dioxide.
- Activated sludge should have the ability to settle quickly so that it can:
- be rapidly pumped back from sedimentation tank to aeration tank
- absorb pathogenic bacteria present in waste water while sinking
to the bottom of the settling tank
- be discarded and anaerobically digested
- absorb colloidal organic matter.
- Match the items in Column ‘A’ and Column ‘B’ and choose correct answer.
Column A Column B
(i) Lady bird (a) Methano bacterium
(ii) Mycorrhiza (b) Trichoderma
(iii) Biological control (c) Aphids
(iv) Biogas (d) Glomus
The correct answer is:
- a) i b, ii d, iii c, iv a
- b) i c, ii d, iii b, iv a
- c) i d, ii a, iii b, iv c
- d) i c, ii b, iii a, iv d
- Which one is the most important role of micro organism for the well being
of humans?
- sewage treatment
- production of methane
- biological control of plant disease
- conversion of milk to curd.
Ans 1-c 2-d 3-d 4-c 5-d 6-b
7-d 8-a 9-c 10-b 11-b 12-d
13-d 14-c 15-c 16-a 17-a 18-b