The gene ‘Bt toxin’ is obtained from:
Prokaryotes
Eukaryotes
Both (a) and (b)
All of the above
As discussed in Insect Resistant Transgenic Plant - Bt Cotton -
Bt toxin gene is obtained from a bacteria called Bacillus thuringiensis which is a prokaryote. This gene has been incorporated into crop plants such as cotton to provide resistance to corn borer. Hence, the correct option is (a).