The ability of a cell to grow into a complete plant is called:

Options

A. Protoplasmic fusion
B. Tissue culture
C. Cellular totipotency
D. Somaclonal hybridisation

Explanation

To solve the question "The ability of a cell to grow into a complete plant is called:", we need to analyze the options provided and understand the concept of cellular totipotency.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the specific term that describes a cell's ability to develop into a complete plant.

2. **Analyzing the Options**:
- **Protoplasmic Fusion**: This refers to the process of fusing the protoplasts of two different cells, which does not specifically relate to the ability of a single cell to develop into a complete plant.
- **Tissue Culture**: This is a technique used to grow plant cells in a controlled environment, but it does not specifically refer to the ability of a single cell to become a complete plant.
- **Cellular Totipotency**: This term refers to the ability of a single cell to divide and differentiate into all the different cell types that make up a complete organism, including all the tissues and organs of a plant.
- **Soma-clonal Hybridization**: This is a method used to create hybrids from somatic cells, but it does not define the ability of a single cell to grow into a complete plant.

3. **Identifying the Correct Answer**: Among the options, "Cellular Totipotency" is the only term that accurately describes the ability of a single cell to grow into a complete plant.

4. **Conclusion**: The correct answer to the question is "Cellular Totipotency".

### Final Answer:
The ability of a cell to grow into a complete plant is called **Cellular Totipotency**.