The large holes in 'Swiss cheese' are due to production
of CO2 by
1. Saccharomyces cerevisiae.
2. Lactobacillus acidophilus.
3. Propionibacterium sharmanii.
4. Penicillium roqueforti.
In mycorrhiza association the fungal symbiont
helpful in :
1. Phosphorus nutrition.
2. Resistance to root borne pathogen.
3. Tolerance to salinity and drought.
4. All the above.
Identify the stage of sewage treatment shown below.
1. Primary treatment
2. Secondary treatment
3. Tertiary treatment
4. Filtration and sedimentation
Find out which one of the following statement is not correct with respect to gobar-gas plant?
1. It has a floating cover which keeps on rising as gas is produced
2. It is developed by IARI and KVIC
3. Main gas produced is butane, isobutene & propane
4. Spent slurry may be used as fertilizer
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)
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 |
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. |
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 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 |
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