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What is true about Bt toxin?...

What is true about Bt toxin?

A

The inactive protoxin gets converted into active form in the insect gut

B

Bt proteins exists as active toxin in the Bacillus

C

The activated toxin enters the ovaries of the pest to sterillse it and thus, prevent its multiplication

D

The concerned Bacillus has antitoxins

Text Solution

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The correct Answer is:
A
Bacillus thuringiensis toxin is an inactive protoxin, which gets converted into active form in the insect gut. It works as an insecticide.
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Read the following and answer questions from Q.1. to Q.5. given below: Plants having foreign genes in their genome through genetic engineering are called transgenic plants. Genes can be incorporated either through a vector or through direct introduction of DNA. Bt cotton is a genetically modified organism which is pestresistant. It contains gene cry I Ac and cry II Ab of Bacillus thuringiensis. It is used to control lepidopterans, coleopterans and dipterans. Bt cotton can resist cotton bollworm and produce higher yields. Cry gene produces cry protein or Bt toxin. It is an endotoxin which remains as protoxin in plants and converted to active toxin after getting ingested by the insects. Alkaline pH of the insect gut solubilizes the protein crystals, the activated toxin creates pores to the mid guts wall of theinsects which cause them to death. What is true about Bt cotton crops?

NEET PREVIOUS YEAR (YEARWISE + CHAPTERWISE)-MICROBES IN HUMAN WELFARE-EXERCISE
  1. The bacterium Bacillus thuringiensis is widely used in contemporary bi...

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  2. Which of the following is not used as a biopesticide ?

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  3. What is true about Bt toxin?

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  4. Cry 1 endotoxins obtained from Bacillus Thuringiensis are effective ag...

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  5. Main objective of production of herbicide resistant GM crops is to

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  6. Which proves to be effective biological control for nematodal pathogen...

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  7. Which proves to be effective biological control for nematodal pathogen...

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  8. Which of the following statements is correct ?

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  9. Which one of the following is being utilized as a source of biodiesel ...

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  10. A free-living nitrogen-fixing cyanobacterium which can also form symbi...

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  11. The most likely reason for the development of resistence against pesti...

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  12. During anaerobic digestion of organic waste, such as in the producing ...

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  13. Which of the following plants are used as green manure in crop fields ...

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  14. Aquatic fern which is an excellent biofertilizer

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  15. Farmers have reported over 50% higher yields of rice by using which of...

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  16. Biological control component is central to advanced agricultural produ...

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  17. Agent orange is

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  18. Which of the microrganisms is used for production of citric acid in in...

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  19. Which of the following is a non-symbiotic biofertiliser ?

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  20. Suppression of reproduction of one type of organism by utilising some ...

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