Which of the following is not heterosporous ?

Options

A. Selaginella
B. Salvinia
C. Lycopodium
D. none of these

Answer

To solve the question "Which of the following is not heterosporous?" we will analyze each of the given options: Salignella, Salvenia, and Lycopodium.

### Step-by-Step Solution:

1. **Understanding Heterospory**:
- Heterospory refers to the production of two different types of spores: microspores (male) and megaspores (female). This is a characteristic of certain plants.

2. **Analyzing Salignella**:
- Salignella is known to be heterosporous. It produces both microspores and megaspores.

3. **Analyzing Salvenia**:
- Salvenia is also heterosporous. Similar to Salignella, it produces two types of spores: microspores and megaspores.

4. **Analyzing Lycopodium**:
- Lycopodium is not heterosporous; it is homosporous. This means it produces only one type of spore, which is not differentiated by sex.

5. **Conclusion**:
- Since Lycopodium is the only plant among the options that does not produce two types of spores, it is the correct answer to the question.

### Final Answer:
- The plant that is not heterosporous is **Lycopodium**.