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Solution:
Some strains of Bacillus thuringiensis produce proteins that kill some insects like lepidopterans (tobacco budworm, armyworm), coleopterans (beetles) and dipterans (flies, mosquitoes).
B. thuringiensis forms protein crystals which contain a toxic insecticidal protein.
The toxin is coded by a gene called cry which is of various types. For example, proteins encoded by the genes cryIAc and cryIIAb control the cotton bollworms and that of cryIAb control corn borer.
![Q43. Bt cotton variety that was developed by the introduction of toxin gene of Bacillus thuringiensis (Bt) is resistant to](https://static.wixstatic.com/media/11062b_84fd4f3425564c84818db9f6c5a1f071~mv2_d_5616_3744_s_4_2.jpg/v1/fill/w_680,h_385,al_c,q_80,usm_0.66_1.00_0.01,enc_auto/vlcsnap-2021-07-19-18h08m15s115.jpg)
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