Q.A toxic protein called delta endotoxin is insecticidal and it is produced by :

Insect-resistant Bt crops carry a crystal (Cry) toxin gene from Bacillus thuringiensis, which produces over 200 distinct Bt toxins, most harmful only to a specific range of insect larvae and harmless to other life; ingested toxin dissolves in the insect gut, disrupts epithelial potassium-ion regulation, and kills the gut's epithelial cells. Bt Cotton targets the cotton bollworm, raising yield through effective bollworm control and cutting insecticide use, but has real limitations - high seed cost, effectiveness dropping after ~120 days, no protection against sucking pests like aphids/jassids/whitefly, and some harm to pollinating insects. Bt Brinjal carries the Cry1Ac gene (delivered via Agrobacter …