Bt cotton is not

Options

A. a GM plant
B. insect resistant
C. a bacterial gene expressing system
D. resistant to all pesticides

Answer

To solve the question "Bt cotton is not," we need to analyze the options provided and understand what Bt cotton is and what it is not.

### Step-by-Step Solution:

1. **Understanding Bt Cotton**:
- Bt cotton is a genetically modified (GM) plant that has been engineered to express a protein from the bacterium *Bacillus thuringiensis* (Bt). This protein is toxic to certain insects, making the plant resistant to them.

2. **Evaluating the Options**:
- **Option A: GM Plant**: This is true. Bt cotton is indeed a genetically modified organism (GMO).
- **Option B: Insect Resistant**: This is also true. Bt cotton is designed to be resistant to specific insect pests due to the Bt toxin it produces.
- **Option C: Bacterial Gene Expression System**: This is somewhat misleading. While the gene comes from a bacterium, the term "bacterial gene expression system" typically refers to the method of expressing genes in bacteria, not in plants. However, the gene is expressed in the plant, so this option is not entirely accurate in the context of what Bt cotton is.
- **Option D: Resistant to All Pesticides**: This is false. Bt cotton is specifically designed to be resistant to certain insects, not all pesticides. It does not provide resistance to herbicides or other types of pesticides.

3. **Conclusion**:
- Based on the analysis of the options, the correct answer to the question "Bt cotton is not" is **Option D: Resistant to all pesticides**.

### Final Answer:
Bt cotton is not resistant to all pesticides.