One of the following does not show heterospory `:`

Options

A. Pinus
B. Selaginella
C. Moss
D. Sunflower

Answer

To determine which of the following plants does not show heterospory, we need to analyze each option provided: Pinus, Selaginella, Moss, and Sunflower.

### Step-by-Step Solution:

1. **Understanding Heterospory**:
- Heterospory refers to the production of two different types of spores: microspores (smaller, male spores) and megaspores (larger, female spores).

2. **Analyzing Pinus**:
- Pinus is a gymnosperm. Gymnosperms are known to be heterosporous, meaning they produce both microspores and megaspores. Thus, Pinus does show heterospory.

3. **Analyzing Selaginella**:
- Selaginella is a type of pteridophyte. While most pteridophytes are homosporous (producing only one type of spore), Selaginella is an exception as it is heterosporous. Therefore, Selaginella does show heterospory.

4. **Analyzing Moss**:
- Mosses are part of the bryophytes group. Bryophytes are primarily homosporous, meaning they produce only one type of spore. Therefore, mosses do not show heterospory.

5. **Analyzing Sunflower**:
- Sunflower is an angiosperm. Angiosperms are generally heterosporous as they produce both microspores and megaspores. Thus, Sunflower does show heterospory.

6. **Conclusion**:
- Among the options provided, the plant that does not show heterospory is **Moss**.

### Final Answer:
The correct answer is **Moss** (option 3).

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