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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 |
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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| 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 |
Hippodamia convergens is used as the biocontrol agent for:
| 1. | Mosquito larvae | 2. | Aphids |
| 3. | Bollworms | 4. | Armyworms |
A biological control being developed for use in the treatment of plant diseases is the fungus:
| 1. | Trichoderma | 2. | Pneumocystis |
| 3. | Claviceps | 4. | Epidermophyton |
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| 1. | Aphids | 2. | Mosquito |
| 3. | Spider mites | 4. | Nematodes |
What is incorrect regarding organic farming?
| 1. | It relies on controlling pests by natural predation rather than introduced chemicals. |
| 2. | A key belief of the organic farmer is that biodiversity furthers health. |
| 3. | Pests are totally eradicated. |
| 4. | Reduces dependence on toxic chemicals and pesticides. |
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The strategy for biological pest control in which a large population of natural enemies is administered for quick pest control is called:
| 1. | Importation | 2. | Augmentation |
| 3. | Conservation | 4. | IPM |
| Assertion (A): | The organic farmer holds the view that eradication of pest is undesirable |
| Reason (R): | Biocontrol is not a good strategy to control pest |
| 1. | Both (A) and (R) are True and the (R) is the correct explanation of the (A) |
| 2. | Both (A) and (R) are True but the (R) is not the correct explanation of the (A) |
| 3. | (A) is True but (R) is False |
| 4. | Both (A) and (R) are False |
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Q. No.
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