Assertion (A) : Acidic pH of insect converts inactive Bt toxin into active form
Reason (R) : Most of Bt toxins are insect group specific.

Options

A. A and R true and R is incorrect explanation of A
B. A and R are true and R is not the correct explanation of A
C. A is true, R is false
D. A is false, R is true

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**: The assertion states that "Acidic pH of insect converts inactive Bt toxin into active form." To evaluate this, we need to know the pH of the insect gut and how it affects the Bt toxin.

2. **Evaluating the pH of Insect Gut**: The gut of most insects is alkaline, not acidic. This means that the assertion is incorrect because it claims that an acidic environment activates the Bt toxin, whereas it is actually the alkaline conditions that facilitate this conversion.

3. **Understanding the Reason (R)**: The reason states that "Most of Bt toxins are insect group specific." This is a true statement. Different Bt toxins target specific groups of insects, which is crucial for their effectiveness in pest control.

4. **Conclusion**: Since the assertion (A) is false and the reason (R) is true, we can conclude that the correct relationship between the two statements is that the reason does not support the assertion.

5. **Final Answer**: Based on the evaluation, the correct option is that the assertion is false and the reason is true.