Read the following four statements (1 – 4), find out certain mistakes in two of them.
(1) | In our stomach lactic acid bacteria play a beneficial role by checking the growth of disease-causing microbes. |
(2) | Lactic acid bacteria produce acid, that coagulates and completely digests the milk protein. |
(3) | Lactic acid bacteria improves the nutritional quality by increasing the amount of Riboflavin |
(4) | Lactic acid bacteria require a suitable temperature for their multiplication. |
Which of the two statements given above are not correct?
1. Statements (1) and (2)
2. Statement (1) and (3)
3. Statement (2) and (3)
4. Statements (2) and (4)
Which is not correct about methanogens?
1. they are archaebacteria
2. they live in marshy areas
3. Methane is their preferred carbon source
4. They are present in guts of several ruminant animals (cow, buffaloes) and they produce biogas (CH) from the dung of these animals.
Pathogens of Arthropods effectively used as biological control agents include
1. Trichoderma
2. Baculoviruses
3. Agrobacterium tumefaciens
4. E. Col
Monascus purpureus is a
i. Bacteria
ii. Yeast
iii. Produces cyclosporin A
iv. Produces statins
1. i, iii
2. ii, iii
3. i, iv
4. ii, iv
Which of the following option is not true for penicillin?
1. | Its full potential as an effective antibiotic was established much later by Ernest Chain and Howard Florey. |
2. | This antibiotic was extensively used to treat American soldiers wounded in World War II. |
3. | Produced by the bacteria. |
4. | both 2 and 3 |
Among the following pairs of microbes, which pair has both the microbes that can be used as biofertilizers?
1. Aspergillus and Rhizopus
2. Rhizobium and Rhizopus
3. Cyanobacteria and Rhizobium
4. Aspergillus and Cyanobacteria
Which of the following statements about methanogens is not correct?
1. | They can be used to produce biogas. |
2. | They are found in the rumen of cattle and their excreta. |
3. | They grow aerobically and breakdown cellulose-rich food. |
4. | They produce methane gas. |
For a biocontrol agent to be part of an integrated pest management, it should be:
1. | species-specific and symbiotic |
2. | free living and broad spectrum |
3. | narrow spectrum and symbiotic |
4. | species-specific and inactive on non-target organisms |
Find incorrect statement/s with respect to sewage treatment
(a) Primary treatment involves filtration and sedimentation of activated sludge
(b) ‘Flocs’ refers to masses of aerobic bacteria associated with fungal filaments to form mesh like structures
(c) Aerobic treatment continues till the BOD is reduced
(d) Aerobic bacteria kill other kind of bacteria and fungi present in the activated sludge
1. (b) & (d)
2. (a) & (c)
3. (b) & (c)
4. (a) & (d)
In the STPs, biological process of microbial degradation of organic matter involves
1 Utilisation of activated sludge as inoculant produced in the physical process
2 Mainly involves anaerobic breakdown of organic matter
3 Masses of unicellular bacteria entangled in filamentous bacterial forms represent flocs
4 BOD is greatly reduced by the microbial activity