- 1(current)
Q. No.In Bt cotton, the Bt toxin present in plant tissue as pro-toxin is converted into active toxin due to:
2. acidic pH of the insect gut
3. action of gut microorganisms
4. presence of conversion factors in the insect gut
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following Bt crops is being grown in India by the farmers?
| 1. | Cotton | 2. | Brinjal |
| 3. | Soybean | 4. | Maize |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyBacillus 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. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologySome of the characteristics of Bt cotton are:
| 1. | long fibre and resistance to aphids |
| 2. | medium yield, log 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyThe 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
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhat 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 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology| 1. | mosquitoes | 2. | flies |
| 3. | nematodes | 4. | bollworms |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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