Q. No.
One of the major difficulties in the biological control of insect/pest is that
(1) The method is less effective as compared with the use of insecticides
(2) The practical difficulty of introducing the predator to specific areas
(3) The predator develops a preference to other deits and may itself become a pest
(4) The predator does not always survive when transferred to a new environment
(1) The method is less effective as compared with the use of insecticides
(2) The practical difficulty of introducing the predator to specific areas
(3) The predator develops a preference to other deits and may itself become a pest
(4) The predator does not always survive when transferred to a new environment
What are flocs?
(1) Masses of anaerobic bacteria
(2) Masses of aerobic fungi only
(3) Masses of anaerobic bacteria and fungi
(4) Masses of aerobic bacteria associated with fungal filaments
All are correct with respect to BOD (Biochemical oxygen Demand), except
1. It refers to the amount of oxygen that would be consumed if all the organic matter in one liter of water were oxidized by bacteria
2. The BOD test is a measure of the organic matter present in the water
3. The greater the BOD of waste water, less is its polluting potential
4. Waste water is treated till BOD is reduced significantly
During sewage treatment, biogases are produced which include :
1. Methane,oxygen, hydrogen sulphide
2. Hydrogen sulphide, methane, sulphur dioxide
3. Methane, hydrogen sulphide, carbon dioxide
4. Hydrogen sulphide, nitrogen, methane
Match the following :
|
(a) |
Lactobacillus |
(i) |
Cheese |
|
(b) |
Saccharomyces cerevisiae |
(ii) |
Curd |
|
(c) |
Aspergillus niger |
(iii) |
Citric Acid |
|
(d) |
Acetobacter aceti |
(iv) |
Bread |
|
(v) |
Acetic acid |
Select the correct option:
| Options: | (a) | (b) | (c) | (d) |
| 1. | (ii) | (i) | (iii) | (v) |
| 2. | (ii) | (iv) | (v) | (iii) |
| 3. | (ii) | (iv) | (iii) | (v) |
| 4. | (iii) | (iv) | (v) | (i) |
Select the correct group of biocontrol agents:
1. Nostoc, Azospirillum, Nucleopolyhedrovirus
2. Bacillus thuringiensis. Tobacco mosaic virus, Aphids
3. Trichoderma, Baculovirus, Bacillus thuringiensis
4. Oscilatoria, Rhizobium, Trichoderma
Which of the following can be used as biocontrol agent in the treatment of plant disease?
1. Lactobacillus
2. Trichoderma
3. Chlorella
4. Anabaena
Which one of the following pairs is wrongly matched?
1. Methanogens - Gobar gas
2. Yeast - Ethanol
3. Streptomycetes - Antibiotic
4. Coliforms - Vinegar
A genetically engineered micro-organism used successfully in the bioremediation of oil spills is a species of:
1. Pseudomonas
2. Trichoderma
3. Xanthomonas
4. Bacillus
1. bioremediation of contaminated soils
2. reclamation of wastelands
3. gene transfer in higher plants
4. biological control of soil-borne plant pathogens
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