One of the following does not show heterospory `:`

Options

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

Answer

To solve the question "One of the following does not show heterospory," we will analyze the options provided: Pinus, Selaginella, Moss, and Sunflower.

### Step-by-Step Solution:

1. **Understand Heterospory**:
- Heterospory refers to the production of two different types of spores by a plant's sporophyte. These spores are typically categorized as microspores (male) and megaspores (female).

2. **Analyze Each Option**:
- **Pinus**: This is a genus of coniferous trees that produces both microspores and megaspores. Therefore, Pinus exhibits heterospory.
- **Selaginella**: This is a type of lycophyte that also produces two types of spores: microspores and megaspores. Thus, Selaginella is heterosporous.
- **Moss**: Mosses are non-vascular plants that typically produce only one type of spore. However, some mosses can show heterospory, but they are generally considered homosporous.
- **Sunflower**: Sunflowers are flowering plants (angiosperms) that produce only one type of spore. They are classified as homosporous.

3. **Conclusion**:
- Among the options, Sunflower is the only plant that does not show heterospory, as it produces only one type of spore.

### Final Answer:
The correct option is **Sunflower**.

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