Q. Consider the following statements about Bacillus thuringiensis:

1. It is widely used as an insecticide.
2. It is the source of the gene responsible for producing Bt toxin in some genetically modified plants.
3. It is an indicator of water pollution.

Which of the above statements is/are correct?
Answer: Only 1 and 2
Notes: Bacillus thuringiensis (Bt) is commonly used as a biological insecticide, and its genes are employed in genetically modified crops to produce Bt toxin for pest resistance. However, Bt is not considered an indicator of water pollution. Thus, only statements 1 and 2 are correct; statement 3 is incorrect.