Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to

Bt. cotton varieties resistant to insect pests like cotton bollworm are developed by incorporating the cry genes into the host plant using Agrobacterium based plasmid vectors.
Bacillus thuringiensis, a soil bacterium, expresses cry genes that code for crystalline protein, which is toxic for certain insect pests, like caterpillars.
(2), (3), (4) Bt. cotton variety is not resistant to fungal pathogens, plant nematodes or insect predators.