`T_(i)` plasmid transfroms cell of

Options

A. Animal
B. Plants
C. Bacteria
D. Fungi

Answer

### Step-by-Step Solution:

1. **Understanding TI Plasmid**: The TI (Tumor Inducing) plasmid is a type of plasmid found in the bacterium Agrobacterium tumefaciens. This bacterium is known for its ability to transfer genetic material to plant cells.

2. **Identifying the Host Cells**: The primary host cells that TI plasmid can transform are plant cells. This is because Agrobacterium tumefaciens naturally infects plants and transfers part of its plasmid DNA into the plant genome.

3. **Mechanism of Transformation**: The TI plasmid carries genes that can induce tumor formation in plants, which is a result of the integration of the plasmid DNA into the plant's genome. This is a key feature that makes TI plasmid useful in plant genetic engineering.

4. **Exclusion of Other Options**:
- **Animal Cells**: TI plasmids do not transform animal cells as they are specifically adapted to interact with plant cells.
- **Bacteria**: While the TI plasmid originates from a bacterium, it does not transform other bacteria in the same way it transforms plant cells.
- **Fungi**: Similar to bacteria, TI plasmids do not have the mechanism to transform fungal cells.

5. **Conclusion**: Based on the above points, the correct answer to the question "TI plasmid transforms cells of" is **plants**.