The American multinational company, Monsanto has produced an insect resistant cotton variety that is undergoing field- trails in India. A toxin gene from which ONE of the following bacteria has been transferred to this transgenic cotton?

1. The question refers to insect-resistant cotton variety produced by Monsanto, commonly known as Bt cotton. 2. This transgenic cotton incorporates a gene from a bacterium that produces a toxin lethal to certain insect pests, particularly the cotton bollworm. 3. The bacterium from which this toxin gene (specifically, a Cry gene) is derived is Bacillus thuringiensis (Bt). 4. This naturally occurring soil bacterium produces crystal proteins (Cry proteins) that are toxic to specific insect species. 5. Transferring the gene responsible for producing this toxin into cotton plants makes the plants themselves produce the toxin, thereby conferring resistance to targeted insects. 6. The other Bacillus species listed (Bacillus subtilis, Bacillus amyloliquefaciens, Bacillus globlii) are used in various biotechnological applications but are not the source of the primary insecticidal toxin gene used in widely commercialized Bt cotton.