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 |
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 |
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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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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The major problem with the use of chemicals to control plant diseases and pests is:
1. High cost
2. Ineffectivity against most pathogens
3. Difficulty in production
4. Non-specific nature
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Match each item in Column I [biocontrol agent] with one in Column II [pest controlled] and select the answer from the codes given:
|
Column I |
|
Column II |
A. |
Ladybird |
P. |
Mosquitoes |
B. |
Dragonflies |
Q. |
Aphids |
C. |
Trichoderma |
R. |
Fungus |
D. |
Baculoviruses |
S. |
Virus |
Codes
A |
B |
C |
D |
|
1. |
P |
Q |
R |
S |
2. |
Q |
P |
R |
S |
3. |
P |
Q |
S |
R |
4. |
Q |
P |
S |
R |
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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 |