Ti plasmid is being used as cloning vectors for:

Options

A. Animals
B. Plants
C. Bacteria
D. Both (A) and (B)

Answer

To solve the question "Ti plasmid is being used as cloning vectors for:", we need to analyze the options provided and understand the context of Ti plasmids in biotechnology.

### Step-by-Step Solution:

1. **Understanding Ti Plasmid**:
- Ti plasmid stands for "Tumor Inducing plasmid". It is a plasmid found in the bacterium *Agrobacterium tumefaciens*.
- This plasmid is known for its ability to transfer genes into plant cells, which can lead to the formation of tumors (galls) in plants.

2. **Role of Cloning Vectors**:
- Cloning vectors are DNA molecules used to deliver genetic material into a host cell. They are essential tools in genetic engineering and biotechnology.
- The Ti plasmid acts as a vector to introduce foreign DNA into plant cells.

3. **Analyzing the Options**:
- **A. Animals**: Ti plasmids are not used for cloning in animals.
- **B. Plants**: Ti plasmids are primarily used to transfer genes into plant cells, making this option likely correct.
- **C. Bacteria**: While Ti plasmids originate from bacteria, they are not used to clone bacteria themselves.
- **D. Both A and B**: Since Ti plasmids are not used for animals, this option is incorrect.

4. **Conclusion**:
- Based on the understanding of Ti plasmids and their function, the correct answer is **B. Plants**.

### Final Answer:
**B. Plants**