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The Bt gene used to make insect-resistant GM crops is obtained from which organism?
AFungus Aspergillus niger
BVirus that infects insects
CTobacco plant Nicotiana
DBacterium Bacillus thuringiensis
Answer & Solution
Correct answer: D. Bacterium Bacillus thuringiensis
1. Insect-resistant GM plants carry a gene that makes a toxin lethal to insects.
2. This Bt gene comes from the bacterium Bacillus thuringiensis.
3. The other organisms listed are not the source of the Bt toxin gene, so they are distractors.
4. Hence the answer is D.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit "Breeding and Biotechnology", p.302_
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