Bt cotton is resistant to bollworm, it is due to
(a) Bt is repellent to bollworm(b) Bt is contact poison for bollworm
(c) Bt is stomach poison; it changes the permeability of stomach
due to generation of pores in alkaline environment of stomach
(d) Bt is causing death due to asphagsiation of insect
(a) Bt is repellent to bollworm(b) Bt is contact poison for bollworm
(c) Bt is stomach poison; it changes the permeability of stomach
due to generation of pores in alkaline environment of stomach
(d) Bt is causing death due to asphagsiation of insect