Microbes in Human Welfare (Class - XII)
Microbes in Human Welfare (Class - XII)
Questions
The commercial production of drugs from alcohol is possible by using a fungus called
- Rhizopus stolonifer
- Saccharomyces cerevisiae
- Penicillium notatum
- Mucor indicus
Antibiotic(s) obtained from bacillus species is/are
- penicillin
- polymyxin B and polymyxin E
- cephalosporin
- fluoroquinolone
Cow dung used for biogas production is rich in
- Rhizobium
- Methanobacterium
- Acetobacter aceti
- Lactobacillus
- All of the above
Thuriside, a proteinaceous toxin, is obtained from
- biofertilisers
- green manure
- bacterial culture
- farmyard manure
Which of the following vaccines belongs to the second generation?
- BCG
- Polio vaccine
- Hepatitis-B vaccine
- Small pox vaccine
Which of the following statements is/are true regarding the microbe Lactobacillus?
(a) It grows in milk and converts it into cheese.
(b) It grows in curd.
(c) It is commonly called lactic acid bacterium.
(d) LAB produces acids that coagulate and partially digest the milk proteins.
(e) It improves the nutritional quality of the milk.
- Both (a) and (b)
- Only (c)
- (b), (c) and (d)
- (c), (d) and (e)
- Both (b) and (e)
Biofertilisers are organisms that enrich the nutrient quality of the soil. Which of the following microbes are used as biofertilisers?
- Bacteria
- Cyanobacteria
- Algae
- All of the above
Which of the following statements is/are false regarding methanogens (Methanobacteria)?
(a) They grow anaerobically.
(b) These bacteria are also present in the rumen of cattle.
(c) They help produce biogas.
- Only (a)
- Only (b)
- Only (c)
- None of these
- Both (a) and (b)
Match the following:
| Column - I | Column - II |
| A. Biogas | i. Pseudomonas putida |
| B. Oil pollution | ii. Saccharomyces cerevisiae |
| C. Gasohol | iii. Penicillium roqueforti |
| D. Cheese production | iv. Methanogens |
- A – iii, B – iv, C – i, D – ii
- A – iv, B – i, C – ii, D – iii
- A – iv, B – ii, C – iii, D – i
- A – iii, B – iv, C – ii, D – i
Treatment of waste water is done by heterotrophic microbes naturally present in the sewage. These microbes are
- the bacteria that use organic compounds as a source of energy and carbon
- the bacteria that are able to synthesise their own organic food from inorganic substances
- the bacteria that live in a mutually beneficial association with other organisms
- the bacteria that manufacture organic compounds from inorganic raw materials utilising energy liberated from the oxidation of inorganic substances
- None of these
The dough which is used for making bread, is fermented by using baker’s yeast. What is the scientific name of this yeast?
- Staphylococcus
- Penicillium notatum
- Aspergillus niger
- Saccharomyces cerevisiae
- None of these
Which of the following bacteria is used to remove clots in heart patients?
- Streptococci
- Lactobacillus
- Methanobacterium
- Anabaena
- Aspergillus
Match the following:
| 1 | Lipase | a | In bottled juices |
| 2 | Pectinase | b | To remove clots |
| 3 | Streptokinase | c | In laundry detergents |
- 1 - a, 2 - c, 3 - b
- 1 - b, 2 - c, 3 - a
- 1 - c, 2 - a, 3 - b
- 1 - c, 2 - b, 3 - a
- 1 - b, 2 - a, 3 - c
Match the columns:
| Column I | Column II |
| A. Fumaric Acid |
B. Oxalic acid
C. Kojic acid
D. Itaconic acid | (1) <em>Streptococcus lactis</em>
(2) <em>Aspergillus terreus</em>
(3) <em>Aspergillus niger</em>
(4) <em>Rhizopus nigricans
(5) Aspergillus oryzae</em>|
- A – (5), B – (3), C – (2), D – (4)
- A – (4), B – (3), C – (5), D – (2)
- A – (1), B – (5), C – (3), D – (4)
- A – (2), B – (4), C – (1), D – (5)