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Question

Bt cotton/Bt toxin is not 
  1. a GM plant
  2. insect resistant
  3. obtain from bacterial gene 
  4. resistant to all pesticides


Solution

The correct option is D resistant to all pesticides
Bt cotton is a genetically modified (GM) plant whose genes have been altered by the manipulations to make it insect resistant through the introduction of Bt toxin gene. It is an insecticides (not pesticides) for certain insects like lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).
 
Bt toxin is produced by a bacterium called Bacillus thuringiensis (Bt). Bt toxin gene has been cloned from the bacteria which is expressed in plants to provide resistance to insects. 

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