A toipotent cell means

Options

A. An undifferentiated cell capable of developing into a system or entire plant
B. An undifferentiated cell capable of developing into an organ
C. An undifferentiated cell capable of developing into complete embryo
D. Cell which lacks the capability to differentiate into an organ or system.

Answer

### Step-by-Step Solution:

1. **Definition of Totipotent Cells**:
- Totipotent cells are derived from the Latin term "totipotentia." These cells have the unique ability to develop into any type of cell in an organism.

2. **Characteristics of Totipotent Cells**:
- A totipotent cell can give rise to all differentiated cells in an organism, meaning it has the potential to form any type of tissue or organ.

3. **Role in Tissue Culture**:
- In plant tissue culture, totipotent cells are utilized to regenerate whole plants from a single cell or tissue sample. This process involves placing the tissue in a nutrient-rich culture medium.

4. **Correct Option Identification**:
- Among the given options, the correct definition of a totipotent cell is: "an undifferentiated cell capable of developing into a system or entire plant." This aligns with the characteristics of totipotent cells.

5. **Elimination of Incorrect Options**:
- The other options can be eliminated based on their definitions:
- "An undifferentiated cell capable of developing into an organ" is incorrect because totipotent cells can develop into an entire plant, not just an organ.
- "An undifferentiated cell capable of developing into a complete embryo" is also incorrect as it does not encompass the full potential of forming an entire plant.
- "Cells which lack the capability of differentiating into an organ or system" is incorrect as totipotent cells are defined by their ability to differentiate.

6. **Final Conclusion**:
- Therefore, the definition of a totipotent cell is: "an undifferentiated cell capable of developing into a system or entire plant."