Cultivation of $B t$ cotton has been much in the news. The prefix $" B t "$ means

"Barium - treated" cotton seeds

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"Bigger thread" variety of cotton with batter tensile strength

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Produced by "biotechnology" using restriction enzymes and ligases

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Carrying an endotoxin gene from Bacillus thuringiensis

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Solution

The correct option is D Carrying an endotoxin gene from Bacillus thuringiensis
The prefix Bt in Bt cotton means Bacillus thuringiensis .
Bacillus thuringenesis is a spore-forming bacterium which produces Bt toxin (endotoxin) that is coded by cry gene. The Bt toxin is insect-specific for example cryIAc gene produces a toxin which controls cotton bollworms and cryIIAb produces a toxin to control corn borer.
So option D is correct.

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