The trigger for activation of toxin of B...

The trigger for activation of toxin of Bacillus thuringiensis is:

high temperature

alkaline pH of gut

acidic pH of stomach

mechanical action in the insect gut

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If you engineer the gene for Bt toxin from Bacillus thuringiensis into a tomato plant, the resulting plant will be:

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. Some strains of Bacillus thuringiensis can kill certain insects such as

Assertion: Bt -toxines kills the Bacillus thuringiensis Reason :Bt-toxins exist as active toxins in Bacillus thuringiensis

GRB PUBLICATION-BIOTECHNOLOGY : APPLICATION IN AGRICULTURE AND HEALTH-Assertion-Reason Type Questions

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