Select the statements that are incorrect regarding Bt toxin.
(1) The toxin is made by the eukaryotic organism
(2) The toxin is a protein and insecticidal.
(3) they are produced in the active form.
(4) The toxin is coded by the cry gene.

Options

A. All except II and IV
B. All except I,II and IV
C. All except I,II and III
D. All except III and IV

Answer

To determine which statements regarding Bt toxin are incorrect, let's analyze each statement one by one:

1. **The toxin is made by the eukaryotic organism.**
- **Analysis:** Bt toxin is produced by *Bacillus thuringiensis*, which is a bacterium. Bacteria are prokaryotic organisms, not eukaryotic. Therefore, this statement is incorrect.

2. **The toxin is a protein and insecticidal.**
- **Analysis:** Bt toxin is indeed a protein that has insecticidal properties. It is specifically designed to target and kill certain insects when ingested. Therefore, this statement is correct.

3. **They are produced in the active form.**
- **Analysis:** Bt toxins are produced in an inactive form. They become active only when they are ingested by the insect and are exposed to the alkaline conditions of the insect's gut. Therefore, this statement is incorrect.

4. **The toxin is coded by the cry gene.**
- **Analysis:** The genes that code for Bt toxins are known as cry genes. This statement is correct.

Now, summarizing the findings:
- **Incorrect Statements:**
- Statement 1: The toxin is made by the eukaryotic organism. (Incorrect)
- Statement 3: They are produced in the active form. (Incorrect)

- **Correct Statements:**
- Statement 2: The toxin is a protein and insecticidal. (Correct)
- Statement 4: The toxin is coded by the cry gene. (Correct)

### Final Answer:
The incorrect statements regarding Bt toxin are:
- (1) The toxin is made by the eukaryotic organism.
- (3) They are produced in the active form.