**Step-by-Step Solution:**
1. **Understanding the Term "Callus":**
- The term "callus" refers to a specific type of tissue that forms in plants. It is important to clarify what callus is and how it differs from other types of cells.
2. **Identifying the Options:**
- The question provides four options to define callus:
1. Decaying cells
2. Differentiated cells
3. Sterile mass cells
4. Undifferentiated mass of cells
3. **Analyzing Each Option:**
- **Decaying Cells:** This refers to dead cells, which do not represent the nature of callus.
- **Differentiated Cells:** These are cells that have specialized functions. Callus is not differentiated; it is a mass of similar cells.
- **Sterile Mass Cells:** This term does not accurately describe callus, as callus is not defined by its sterility.
- **Undifferentiated Mass of Cells:** This option correctly describes callus. Callus consists of cells that have not yet differentiated into specialized types.
4. **Conclusion:**
- Based on the analysis, the correct definition of callus is "undifferentiated mass of cells." Therefore, the answer is option 4.
**Final Answer:**
The callus is defined as an undifferentiated mass of cells.
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