A spermatophyte with ciliated stage is

Options

A. Pteridium
B. Riccia
C. Gymnosperm
D. Angiosperm.

Answer

To solve the question "A spermatophyte with ciliated stage is", we can follow these steps:

### Step 1: Understand the term "spermatophyte"
- **Definition**: Spermatophytes are seed plants, which include both gymnosperms and angiosperms.

### Step 2: Identify the options given
- **Options**:
A. Pteridium (a type of fern, which is a pteridophyte)
B. Rixia (a type of bryophyte)
C. Gymnosperm (seed plants that do not produce flowers)
D. Angiosperm (seed plants that produce flowers)

### Step 3: Analyze the characteristics of each option
- **Pteridium**: This is a pteridophyte and does not have a ciliated stage.
- **Rixia**: This is a bryophyte and also does not have a ciliated stage.
- **Gymnosperm**: Gymnosperms, such as Cycas and Pinus, have male gametes (sperms) that are motile and possess cilia.
- **Angiosperm**: Angiosperms do not have a ciliated stage; their sperm is non-motile.

### Step 4: Conclusion
- Since gymnosperms are the only group among the options that have a ciliated stage in their male gametes, the answer to the question is **C. Gymnosperm**.

### Final Answer
The spermatophyte with a ciliated stage is **C. Gymnosperm**.

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