`T_(i)` plasmic used for making transgenic plants belongs to

Options

A. Clostridium
B. Saccharomyces
C. Agrobacterium
D. Escherichia

Answer

To answer the question about which organism the Ti plasmid used for making transgenic plants belongs to, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ti Plasmid**: The Ti (tumor-inducing) plasmid is a specific type of plasmid that is known for its role in plant genetic engineering. It is crucial for the process of creating transgenic plants.

2. **Identifying the Source**: The Ti plasmid is derived from a bacterium. The question provides four options:
- A. Clostridium
- B. Saccharomyces
- C. Agrobacterium
- D. Escherichia

3. **Recognizing the Correct Bacterium**: Among the options, Agrobacterium tumefaciens is the bacterium known for its ability to transfer DNA into plant cells. This bacterium is a soil plant pathogen that utilizes the Ti plasmid to induce tumors in plants.

4. **Mechanism of Action**: The Ti plasmid contains a segment of DNA known as T-DNA, which can be transferred into the plant cell's nucleus. Once inside, this T-DNA integrates into the plant's genome and can be expressed, leading to the development of transgenic plants.

5. **Conclusion**: Based on the information, the correct answer to the question is that the Ti plasmid used for making transgenic plants belongs to **C. Agrobacterium**.

### Final Answer:
The Ti plasmid used for making transgenic plants belongs to **C. Agrobacterium**.