Answer:
(d)Bt cotton is a genetically
modified plant whose genes have been altered bythemanipulations to make it
insect resistant through the introduction of Bt toxin gene.Bt toxin is produced
by a bacterium called Bacillus thuringiensis (Bt). Bt toxin gene has been
cloned from the bacteria which is expressed in plants to provide resistance to insects.
Some strains of Bacillus thuringiensis
produce proteins that kills certain insects likelepidopterans (tobacco budworm,
armyworm), coleopterans (beetles) and dipterans(flies, 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 Bt cotton plants.
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