- 1(current)
Q. No.| I. | The bacteria Bacillus thuringiensis is an example of a microbial biocontrol agent that can be introduced in order to control butterfly caterpillars. |
| II. | The bacteria are available in sachets as dried spores which are mixed with water and sprayed onto vulnerable plants such as brassicas and fruit trees, where these are eaten by the insect larvae. |
| III. | In the gut of the larvae, the toxin is released and the larvae get killed. |
| IV. | The bacterial disease will kill the caterpillars, but leave other insects unharmed. |
| V. | Because of the inadequate development of methods of genetic engineering, scientists have not been able to introduce B. thuringiensis toxin genes into plants. |
| 1. | 2 | 2. | 3 |
| 3. | 4 | 4. | 5 |
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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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The free-living fungus Trichoderma can be used for:
1. killing insects
2. biological control of plant diseases
3. controlling butterfly caterpillars
4. producing antibiotics
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Baculoviruses are excellent candidates for:
| 1. | Species-specific, narrow-spectrum insecticidal applications |
| 2. | Species-specific, broad-spectrum insecticidal applications |
| 3. | Biocontrol of fungal diseases |
| 4. | Biocontrol of aphids and mosquitoes |
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Mycorrhiza does not help the host plant in:
| 1. | Enhancing its phosphorus uptake capacity |
| 2. | Increasing its tolerance to drought |
| 3. | Enhancing its resistance to root pathogens |
| 4. | Increasing its resistance to insects |
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- 1(current)
Q. No.
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