Question

What is BT cotton ?
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Answer 1

Bt cotton has been genetically modified by the insertion of one or more genes from a common soil bacterium, Bacillus thuringiensis. These genes encode for the production of insecticidal proteins, and thus, genetically transformed plants produce one or more toxins as they grow

Answer 2

For cotton growers, there was a lot of pressure from pests before the introduction of Bt cotton in 1996. Due to synthetic pesticide resistance, farmers were losing much of their cotton to tobacco budworms, cotton bollworms, and pink bollworms.
In 1995, attacks from these pests reduced U.S. cotton yields by over 4%, or by over a quarter billion dollars worth of cotton.