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B
Herbicides
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C
Salt
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D
Drought
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Solution
The correct option is A Insects Bt cotton is a genetically modified variety of cotton producing an insecticide. The gene coding for Bt toxin has been inserted into cotton, causing cotton to produce this natural insecticide in its tissues and make it insect resistant plant. It produces an insecticidal protein from the naturally occurring soil bacterium Bacillus thuringiensis (Bt).