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प्रश्न
What are cry-proteins?
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उत्तर
Bacillus thuringiensis secretes harmful proteins known as insecticidal proteins in the form of cry proteins during a certain growth step. Cry, a gene, codes for the toxin. B. thuringiensis cry protein-encoding genes, often known as Bt toxin genes, have been identified and inserted into numerous crop plants, including Bt cotton, Bt corn, etc., to give insect pest resistance.
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Assertion (A): In Bt cotton, B. thuringiensis produces a toxic insecticidal crystalline protein which destroys bollworms.
Reason (R): B. thuringiensis produces this toxic protein in an inactive form, but when an insect ingests this inactive protein, it is converted into active form of toxin due to the alkaline pH of gut which solubilises the crystals, which is responsible for the death of bollworm.
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The results of the study are depicted in the graph below:
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