Q. No.Prickly pear cacti were introduced into Queensland, Australia as ornamental plants, starting in 1788. They quickly spread to cover over 25 million hectares of Australia by 1920, increasing by 1 million hectares per year. Digging, burning, and crushing all proved ineffective. The biocontrol agent used to control it was:
| 1. | Cactoblastis cactorum | 2. | Trichogramma minutum |
| 3. | Nematus ribesii | 4. | Icerya purchase |
Which of the following fermented beverages is likely to have the least ethyl alcohol content?
| 1. | Whisky | 2. | Brandy |
| 3. | Rum | 4. | Beer |
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Consider the following statements:
| I: | Statins, used as blood cholesterol-lowering agents, are derived from Monascus purpureus |
| II: | Cyclosporin A, derived from Trichoderma, is used as an immunosuppressant |
| III: | Baculoviruses, in the genus Nucleopolyhederovirus, are species-specific, broad-spectrum insecticides |
Which of the above statements are true?
| 1. | I and II only | 2. | I and III only |
| 3. | II and III only | 4. | I, II and III |
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| Statement I: | The plant makes organic molecules such as sugars by photosynthesis and supplies them to the fungus. The fungus supplies to the plant water and mineral nutrients, such as phosphorus, taken from the soil. |
| Statement II: | Mycorrhizal plants are often more resistant to diseases, such as those caused by microbial soil-borne pathogens. |
| 1. | Statement I is correct but Statement II is incorrect |
| 2. | Statement I is incorrect but Statement II is correct |
| 3. | Statement I is correct and Statement II is correct |
| 4. | Statement I is incorrect and Statement II is incorrect |
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| Statement I: | Biological control or biocontrol is a method of controlling pests, such as insects, mites, weeds, and plant diseases, using other organisms. |
| Statement II: | The upper half shows the Dragonfly that is predator of aphids and the lower half is the Ladybird that is the predator of mosquito. |
| 1. | Only statement I |
| 2. | Only Statement II |
| 3. | Both Statement I and Statement II |
| 4. | Neither Statement I nor Statement II |
The vitamin whose content increases following the conversion of milk into curd by lactic acid bacteria is:
| 1. | vitamin C | 2. | vitamin D |
| 3. | vitamin B12 | 4. | vitamin E |
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During which stage of the sewage treatment are the microbes used?
| 1. | Primary | 2. | Secondary |
| 3. | Tertiary | 4. | Quaternary |
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Hippodamia convergens is used as the biocontrol agent for:
| 1. | Mosquito larvae | 2. | Aphids |
| 3. | Bollworms | 4. | Armyworms |
Match the items in Column ‘A’ and Column ‘B’ and choose the correct answer.
| Column I | Column II | ||
| A. | Lady bird | i. | Methanobacterium |
| B. | Mycorrhiza | ii. | Trichoderma |
| C. | Biological control | iii. | Aphids |
| D. | Biogas | iv. | Glomus |
The correct answer is:
| A | B | C | D | |
| 1. | ii | iv | iii | i |
| 2. | iii | iv | ii | i |
| 3. | iv | i | ii | iii |
| 4. | iii | ii | i | iv |
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