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Question

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

A
"Barium-treated" cotton seeds
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B
"Bigger thread" variety of cotton with better tensile strength
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C
Production by "biotechnology" using restriction enzymes and ligases
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D
Carrying an endotoxin gene from Bacillus thuringiensis.
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Solution

The correct option is D Carrying an endotoxin gene from Bacillus thuringiensis.
Bt cotton is a genetically modified variety of cotton producing an insecticide. The bacterium Bacillus thuringiensis (Bt) is a family of over 200 different proteins, which naturally produce chemicals harmful to selective insects, most notably the larvae of moths and butterflies, beetles, cotton bollworms and flies and harmless to other forms of life. The gene coding for Bt toxin has been inserted into cotton, causing cotton to produce this natural insecticide in its tissues. In many regions, the main pests in commercial cotton are lepidopteran larvae, which are killed by the Bt protein in the transgenic cotton they eat. This eliminates the need to use large amounts of broad-spectrum insecticides to kill lepidopteran pests.

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