Select the mismatch:

Options

A. Pinus - Dioecious
B. Cycas - Dioecious
C. Salvinia - Heterosporous
D. Equisetum - Homosporous

Answer

To solve the question "Select the mismatch," we need to analyze the options provided and identify which one does not correctly match the classification of the organisms based on their reproductive structures.

### Step-by-Step Solution:

1. **Understanding the Terms**:
- **Dioecious**: Refers to species where male and female reproductive organs are found on separate individuals.
- **Monoecious**: Refers to species where both male and female reproductive organs are found on the same individual.
- **Heterosporous**: Refers to plants that produce two different types of spores (microspores and megaspores).
- **Homospore**: Refers to plants that produce only one type of spore.

2. **Analyzing the Options**:
- **Pinus**: This is a gymnosperm where both male and female cones are found on the same tree. Therefore, it is **monoecious**.
- **Cycus**: This is also a gymnosperm, but in Cycus, male and female cones are found on different trees. Thus, it is **dioecious**.
- **Salvinia**: This is a pteridophyte that is **heterosporous**, producing different types of spores.
- **Equisetum**: This is also a pteridophyte but is **homosporous**, producing only one type of spore.

3. **Identifying the Mismatch**:
- The first option states "Pinus, Dicius." Since Pinus is monoecious, this is a mismatch.
- The second option "Cycus, Dicius" is correct as Cycus is dioecious.
- The third option "Salvinia, Heterosporus" is correct as Salvinia is heterosporous.
- The fourth option "Equisetum, Homosporus" is also correct as Equisetum is homosporous.

4. **Conclusion**:
- The mismatch is found in the first option: **Pinus, Dicius**.

### Final Answer:
The mismatch is **Pinus, Dicius**.