Final answer:
The claim that Bt toxin from Bacillus thuringiensis has been used in crops to enhance insect resistance is true. Genetically modified crops with Bt toxin are safer for the environment and minimize the use of synthetic insecticides.
Step-by-step explanation:
The statement that Bt toxin derived from Bacillus thuringiensis has been introduced into some crop plants to make them resistant to insect destruction is true. The Bt toxin requires ingestion by insects to be activated, after which, affected insects cease feeding and die within days. Advances in biotechnology have enabled the cloning of the toxin-producing genes from Bacillus thuringiensis, allowing the creation of genetically modified crops that produce their own Bt toxin for protection against insect pests. This modification has been adopted by farmers to reduce the need for chemical insecticides, as Bt toxin is considered safe for the environment and non-toxic to mammals, including humans.