Assertion: Bt -toxines kills the Bacillus thuringiensis
Reason :Bt-toxins exist as active toxins in Bacillus thuringiensis

Options

A. If both Assertion & Reason are True & the Reason is a correct explanation of the Assertion
B. It both Assertion & Reason are True but Reason is not a correct explanation of the Assetion
C. If Assertion is True but the Reason is False
D. If both Assertion & Reason are false

Answer

To solve the Assertion-Reason question regarding Bt-toxins and Bacillus thuringiensis, we will analyze both the assertion and the reason step by step.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Bt-toxins kill Bacillus thuringiensis."
- This is incorrect because Bt-toxins are produced by Bacillus thuringiensis itself and do not kill the bacteria that produce them.

2. **Understanding the Reason**:
- The reason states that "Bt-toxins exist as active toxins in Bacillus thuringiensis."
- This is also incorrect. Bt-toxins are produced as inactive forms known as protoxins. They only become active when they are ingested by insects and come into contact with the alkaline pH of their gut.

3. **Conclusion**:
- Since both the assertion and the reason are incorrect, we can conclude that neither statement is true.

4. **Final Answer**:
- Therefore, the correct option is that both the assertion and the reason are false.