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(D) $Bt$ cotton, $Bt$ tobacco, $Bt$ tomato, etc., are transgenic plants having the $Bt$ gene encoding $Bt$ toxin (e.g., thurioside).$Bt$ toxin gene ha

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Carrying an endotoxin gene from Bacillus thuringiensis

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(D) $Bt$ cotton, $Bt$ tobacco, $Bt$ tomato, etc., are transgenic plants having the $Bt$ gene encoding $Bt$ toxin (e.g., thurioside).$Bt$ toxin gene has been isolated from a bacterium $Bacillus 	ext{ } thuringiensis$; therefore, it is called $Bt$ (i.e., $Bacillus 	ext{ } thuringiensis$).These plants are resistant to more than $140$ species of insects, including common cabbage worm, caterpillars, bag worms, canker worms, gypsy worm, etc.

Cultivation of $Bt$ cotton has been much in the news. The prefix $Bt$ means

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