Assertion : $B t$ toxin are protein crystals containing insecticidal protein. Reason: Bacillus thuringiensis form these protein crystals throughout continuously during their growth period.

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 C Assertion is correct but Reason is incorrect
The assertion that Bt toxins are protein crystals that contain insecticidal proteins is correct.
But the reason is incorrect. Bacillus thuringiensis forms Bt toxin protein crystals only during a particular phase of their growth, i.e.during sporulation.It exists as inactive protoxin, till insect ingests it, After ingestion, it is converted into active form due to alkaline pH of the gut which solubilizes the crystal and allows the toxin to bind to the gut epithelium and causes cell death by swelling and lysis.

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Assertion :Bt toxin are protein crystals containing insecticidal protein. Reason: Bacillus thuringiensis form these protein crystals throughout continuously during their growth period.

Assertion : $B t$ toxin are protein crystals containing insecticidal protein. Reason: Bacillus thuringiensis form these protein crystals throughout continuously during their growth period.