Q. No.The protein products of the Bt toxin genes--cry -IAc and cry-IIAb are responsible for controlling-
1. Bollworm
2. Moth
3. Roundworm
4. Fruit fly
1. Bollworm
2. Moth
3. Roundworm
4. Fruit fly
Subtopic: Bt Crops |
97%
Level 1: 80%+
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Bt cotton has been genetically modified to:
| 1. | Increase the length of the cotton fibers. |
| 2. | Produce a toxin that kills specific pests. |
| 3. | Resist all types of herbicides. |
| 4. | Improve the quality of the oil obtained from seeds. |
Subtopic: Bt Crops |
96%
Level 1: 80%+
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Bt cotton is important for agriculture because it exhibits:
| 1. | Resistance to round-up herbicide. |
| 2. | Resistance to various bacterial infections. |
| 3. | Resistance to certain insects through the production of a bacterial toxin. |
| 4. | Enhanced growth speed compared to normal cotton. |
Subtopic: Bt Crops |
95%
Level 1: 80%+
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Why does the Bt toxin produced by Bacillus thuringiensis not harm the bacteria itself but kills insects upon ingestion?
| 1. | The toxin is neutralized by the bacteria's cell wall. |
| 2. | The bacteria rapidly degrade the toxin before it becomes harmful. |
| 3. | The toxin targets only mammalian cells, leaving bacterial and insect cells unaffected. |
| 4. | The Bt toxin exists as an inactive protoxin in the bacteria and is activated in the insect's gut due to the alkaline pH, which solubilizes the toxin and causes the death of the insect. |
Subtopic: Bt Crops |
95%
Level 1: 80%+
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What is true about Bt toxin?
| 1. | the inactive protoxin gets converted into active form in the insect gut |
| 2. | Bt protein exists as active toxin in the Bacillus |
| 3. | The activated toxin enters the ovaries of the pest to sterilize it and thus prevent its multiplication |
| 4. | the concerned Bacillus has antitoxins |
Subtopic: Bt Crops |
95%
Level 1: 80%+
AIPMT - 2009
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Bacillus thuringiensis (Bt) strains have been used for designing novel -
| 1. | Bioinsecticidal plants |
| 2. | Bio-mineralization processes |
| 3. | Biofertilizers |
| 4. | Bio-metallurgical techniques |
Subtopic: Bt Crops |
94%
Level 1: 80%+
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Cry proteins exist as inactive protoxins and are activated in:
1. Soil
2. Plant cells
3. Acidic environment
4. Alkaline gut of insects
1. Soil
2. Plant cells
3. Acidic environment
4. Alkaline gut of insects
Subtopic: Bt Crops |
94%
Level 1: 80%+
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Bacillus thuringiensis (Bt) is a widely used bio-control agent that effectively targets insect pests. The mechanism of its action involves:
| 1. | Producing a toxin that disrupts the insect gut lining, causing paralysis and death |
| 2. | Blocking oxygen supply to insects by coating their spiracles |
| 3. | Releasing an enzyme that digests insect exoskeletons, leading to dehydration |
| 4. | Altering insect hormone levels, preventing moulting and development |
Subtopic: Bt Crops |
94%
Level 1: 80%+
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The bacterium Bacillus thuringiensis is widely used in contemporary biology as
| 1. | Bioweapon |
| 2. | Bioinsecticide |
| 3. | Bioweedicide |
| 4. | Indicator of water pollution |
Subtopic: Bt Crops |
93%
Level 1: 80%+
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The bacterium Bacillus thuringiensis is widely used in contemporary biology as a/an
| 1. | indicator of water pollution |
| 2. | insecticide |
| 3. | agent for production of dairy products |
| 4. | source of industrial enzyme |
Subtopic: Bt Crops |
93%
Level 1: 80%+
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