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Some of the characteristics of Bt cotton are
A
High yield and resistance to bollworms
B
Long fibre and resistance to aphids
C
Medium yield, long fibre and resistance to beetle pests
D
High yield and production of toxic protein crystals which kill dipteran pests
Detailed Solution
Bt cotton carries cry genes from $Bacillus\ thuringiensis$; the proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms.
Because the crop is protected from bollworms, the loss is reduced and the yield is high, with less use of insecticide.
The toxin is specific: Bt toxins are insect-group specific, and those in Bt cotton act on lepidopteran bollworms, not on aphids, beetles or dipterans (flies and mosquitoes).
(The protein encoded by cryIAb controls the corn borer.)
Hence Bt cotton shows high yield and resistance to bollworms.
Because the crop is protected from bollworms, the loss is reduced and the yield is high, with less use of insecticide.
The toxin is specific: Bt toxins are insect-group specific, and those in Bt cotton act on lepidopteran bollworms, not on aphids, beetles or dipterans (flies and mosquitoes).
(The protein encoded by cryIAb controls the corn borer.)
Hence Bt cotton shows high yield and resistance to bollworms.