Assertion :Insect-resistant transgenic cotton has been produced by inserting Bt gene. Reason: The Bt gene is derived from a bacterium.

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

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

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
Bacillus thuringiensis (Bt) or Bt toxin is a spore forming insecticidal bacterium that produces crystals protein (cry proteins), which are toxic to many species of insects. The gene coding for Bt toxin has been inserted into cotton as a transgene, causing it to produce this natural insecticide in its tissues. Bt-gene is derived from a soil bacterium Bacillus thuringiensis. It codes for an insecticidal toxin with several variants, each having specificities against different types of insects.

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Q. Assertion :Insect resistant transgenic cotton has been produced by inserting Bt gene. Reason: The Bt gene is derived from a bacterium.

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