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What is true about Bt toxin?...

What is true about Bt toxin?

A

Bt protein exists as active toxin in Bacillus

B

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

C

The concerned Bacillus has antitoxins.

D

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

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The correct Answer is:
D
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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?

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