Question

Assertion: ‘Bt’ toxin gene has been cloned from the bacteria E. coli and expressed in plants to provide resistance from insects without the need of insecticides.

Reason: ‘Bt’ toxin is produced in a crystalline state by the above-mentioned bacterium.

पर्याय

• Both Assertion and Reason are true and Reason is the correct explanation for Assertion.

• Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.

• Assertion is true and Reason is false.

• Both Assertion and Reason are false.

Answer 1

Both Assertion and Reason are false.

Explanation:

Assertion is false because the Bt toxin gene is not cloned from E. coli. It is obtained from the bacterium Bacillus thuringiensis (Bt) and then introduced into plants to make them insect-resistant. E. coli is commonly used only as a host for cloning, not as the natural source of the Bt gene.

Reason is also false as written because the crystalline Bt toxin (Cry protein) is produced by Bacillus thuringiensis, not by E. coli. The statement says “above-mentioned bacterium,” which refers to E. coli here, so it becomes incorrect.