Question

$Bt$ gene has been isolated from

• A. Streptomyces hygroscopicus
• B. Agrobacterium
• C. E. coli
• D. Bacillus thuringiensis

Answer 1

The correct option is D

Bacillus thuringiensis

Bacillus thuringiensis is a soil bacterium that contains genes called $Bt$. These genes code for toxic protein crystals that can cause pores in the gut of a range of insects. Therefore, these genes have been isolated from the bacterium and have been inserted in vulnerable crop plants like cotton to obtain genetically modified insect resistant $Bt$ crops.

Hence, the correct answer is 'Bacillus thuringiensis'