- 1(current)
Q. No.In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:
1. alkaline pH of the insect gut
2. acidic pH of the insect gut
3. action of gut microorganisms
4. presence of conversion factors in the insect gut
2. acidic pH of the insect gut
3. action of gut microorganisms
4. presence of conversion factors in the insect gut
Subtopic: Â Bt Crops |
 94%
Level 1: 80%+
NEET - 2015
Hints
Which of the following Bt crops is being grown in India by the farmers?
| 1. | Cotton | 2. | Brinjal |
| 3. | Soybean | 4. | Maize |
Subtopic: Â Bt Crops |
 90%
Level 1: 80%+
AIPMT - 2013
Hints
RNA interference involves:
| 1. | Synthesis of cDNA from RNA using reverse transcriptase |
| 2. | Silencing of specific mRNA due to complementary RNA |
| 3. | Interference of RNA in the synthesis of DNA |
| 4. | Synthesis of mRNA from DNA |
Subtopic: Â Bt Crops |Â Interference RNA Tech |
 88%
Level 1: 80%+
NEET - 2013
Hints
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. |
Subtopic: Â Bt Crops |
 80%
Level 1: 80%+
AIPMT - 2011
Hints
Some of the characteristics of Bt cotton are:
| 1. | long fibre and resistance to aphids |
| 2. | medium yield, long fibre, and resistance to beetle pests |
| 3. | high yield and production of toxic protein crystals, which kill dipteran pests |
| 4. | high yield and resistance to bollworms |
Subtopic: Â Bt Crops |
 58%
Level 3: 35%-60%
AIPMT - 2010
Hints
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: Â Bt Crops |
 91%
Level 1: 80%+
AIPMT - 2009
Hints
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: Â Bt Crops |
 95%
Level 1: 80%+
AIPMT - 2009
Hints
Cry-IAc endotoxins obtained from Bacillus thuringiensis are effective against:
| 1. | mosquitoes | 2. | flies |
| 3. | nematodes | 4. | bollworms |
Subtopic: Â Bt Crops |
 90%
Level 1: 80%+
AIPMT - 2008
Hints
- 1(current)
Q. No.
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