- 1(current)
Q. No.Some of the characteristics of BT cotton are
1. Medium yield, long fibre and resistance to beetle pests
2. High yield and production of toxic protein crystals which kill dipterans pests
3. High yield and resistance to bollworms
4. Long fibre and resistance to aphids
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Bacillus thuringiensis forms protein crystals which contain insecticidal protein. This protein:
| 1. | does not kill the carrier bacterium which is itself resistant to this toxin |
| 2. | binds with epithelial cells of the midgut of the insect pest ultimately killing it |
| 3. | is coded by several genes including the gene cry. |
| 4. | is activated by acid pH of the foregut of the insect pest. |
Which of the following Bt crops is being grown in India by the farmers?
1. Maize
2. Cotton
3. Brinjal
4. Soybean
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Cry 1 endotoxins obtained from Bacillus thuringiensis are effective against
1. Nematodes
2. Mosquitoes
3. Bollworms
4. Flies
What triggers the activation of protoxin to active Bt toxin of Bacillus thuringiensis in bollworms?
1. Acidic pH of the stomach
2. Body temperature
3. Moist surface of midgut
4. Alkaline pH of the gut
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The bacterium Bacillus thuringiensis is widely used in contemporary biology as
1. Source of industrial enzyme
2. Indicator of water pollution.
3. Insecticide.
4. Agent for production of dairy products.
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In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:
1. Acidic pH of the insect gut
2. Action of gut micro-organisms
3. Presence of conversion factors in insect gut
4. Alkaline pH of the insect gut
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What is true about Bt toxin?
1. The concerned Bacillus has antitoxins.
2. The inactive protoxin gets converted into active form in the insect gut
3. BT protein exists as active toxin in the Bacillus.
4. The activated toxin enters the ovaries of the pest to sterilise it and thus prevent its multiplication
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- 1(current)
Q. No.
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