In saprobic protists, plasmodium undergoes _________ to form spore producing structure in unfavourable conditions.

Options

A. Cell enlargement
B. Aggregation
C. Differentiation
D. More than one option is correct

Answer

To answer the question, "In saprobic protists, plasmodium undergoes _________ to form spore producing structure in unfavourable conditions," we need to analyze the options provided and understand the biological processes involved.

### Step-by-Step Solution:

1. **Understanding Saprobic Protists**:
- Saprobic protists are organisms that obtain nutrients by decomposing organic matter. They thrive in environments where organic material is abundant.

2. **Identifying Plasmodium**:
- In this context, "plasmodium" refers to a stage in the life cycle of certain protists, particularly slime molds, which can exist as a mass of cytoplasm containing many nuclei.

3. **Conditions of Unfavourable Environments**:
- In unfavourable conditions, such as lack of nutrients or adverse environmental factors, these organisms need to adapt to survive.

4. **Processes in Unfavourable Conditions**:
- The options provided suggest different biological processes that could occur in response to these conditions.

5. **Evaluating the Options**:
- **Cell Enlargement**: This option is incorrect because cell enlargement does not lead to the formation of spore-producing structures.
- **Aggregation**: This option is also incorrect as it refers to the clustering of cells, not the formation of spores.
- **Differentiation**: This is the correct answer. Differentiation is the process where cells develop into specialized structures, such as spores, which are more resilient in unfavourable conditions.
- **More than One Option is Correct**: This option is incorrect as only one option is valid.

6. **Conclusion**:
- Therefore, the correct answer to fill in the blank is "differentiation."

### Final Answer:
In saprobic protists, plasmodium undergoes **differentiation** to form spore producing structure in unfavourable conditions.