Consider the following statements about transgenic tobacco palnt.
I. Transgenic tobacco plants contains a gene from a bacterium, Bacillus thuringiensis.
II. Bt gene is an insecticidal protein which damages the inner lining of the insects and kills it (insect).
III. The tobacco plants having Bt gene produces their own insecticide.
Which of the statements given above are correct ?

Options

A. I and II
B. I and III
C. II and III
D. I, II and III

Answer

To solve the question regarding the statements about transgenic tobacco plants, we will analyze each statement one by one.

### Step-by-Step Solution:

1. **Understanding Transgenic Tobacco Plants**:
- Transgenic tobacco plants are genetically modified to contain a foreign gene. In this case, the gene is derived from the bacterium Bacillus thuringiensis (Bt).
- This gene is responsible for producing a protein that provides insect resistance.

2. **Evaluating Statement I**:
- **Statement I**: "Transgenic tobacco plants contain a gene from a bacterium, Bacillus thuringiensis."
- This statement is **correct**. Transgenic tobacco indeed incorporates the Bt gene, which is known for its insecticidal properties.

3. **Evaluating Statement II**:
- **Statement II**: "Bt gene is an insecticidal protein which damages the inner lining of the insects and kills it."
- This statement is also **correct**. The protein produced by the Bt gene acts on the gut of the insect, causing damage that ultimately leads to the insect's death.

4. **Evaluating Statement III**:
- **Statement III**: "The tobacco plants having Bt gene produce their own insecticide."
- This statement is **correct** as well. The presence of the Bt gene allows the tobacco plants to synthesize the insecticidal protein, effectively making them capable of producing their own insecticide.

5. **Conclusion**:
- All three statements (I, II, and III) are correct regarding transgenic tobacco plants.
- Therefore, the correct answer is that all statements are true.

### Final Answer:
All three statements are correct.