Q. No.The common nitrogen-fixer in paddy fields is:
1. Rhizobium
2. Azospirillum
3. Oscillatoria
4. Frankia
The bacteria and mould involved in the work of Alexander Fleming are :-
1. Staphylococci and Penicillium chrysogenum
2. Streptococci and Penicillium chrysogenum
3. Staphylococci and Penicillium notatum
4. Streptococci and Penicillium notatum
Name the product formed by Trichoderma polysporum and give its use.
| 1. | Statins, which are used as blood cholesterol-lowering agent. |
| 2. | Cyclosporin A that is used as an immunosuppressive agent. |
| 3. | Statins, which are used as a clot buster. |
| 4. | Cyclosporin A that is used to inhibit the enzyme responsible for cholesterol synthesis. |
Which one of the following pairs is wrongly matched?
1. Detergents-Lipase
2. Alcohol-Nitrogenase
3. Fruit juice-Pectinase
4. Textile-Amylase
1. bioremediation of contaminated soils
2. reclamation of wastelands
3. gene transfer in higher plants
4. biological control of soil-borne plant pathogens
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
Which one of the following pairs is wrongly matched?
1. Methanogens - Gobar gas
2. Yeast - Ethanol
3. Streptomycetes - Antibiotic
4. Coliforms - Vinegar
Besides dung, the weed that can be used in biogas production is:
1. Hydrilla
2. Solanum nigrum
3. Eichhornia Crassipes
4. Parthenium hysterophorus
1. Fungi
2. Lichen
3. Phytoplankton’s
4. None of the above
Which of the following can be used as biocontrol agent in the treatment of plant disease?
1. Lactobacillus
2. Trichoderma
3. Chlorella
4. Anabaena
© 2026 GoodEd Technologies Pvt. Ltd.