Bt cotton is not

Options

A. a GM plant
B. insect resistant
C. a bacterial gene expressing system
D. resistant to all pesticides

Explanation

Bt cotton is a genetically modified plant whose genes have been altered by the manipulations to make it insect resistant throght the introduction of BT of toxin gene. Bt toxin is produced by a bacterium called Bacillus thuringiensis (Bt). Bt toxin gene has been cioned from the bacteria which is expressed in plants to provide resistance to insects.
Some strains of Bacillus thuringlensis produce proteins that kills certain insects like lepidopterians (tobacco budworm, armyworm), coleopterans (bestides) and dipterans (files, mosquitoes)
Bt cotton is made resistant to certain taxa of pests only (as mentioned above) it is quite likely that in future. some other pests may infest these Br cotton plants.