Protonema and prothallus are respectively:-

Options

A. Diploid and Haploid
B. Diploid and Diploid
C. Haploid nad Diploid
D. Haploid and Haploid

Answer

To answer the question about the nature of protonema and prothallus, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Protonema**:
- Protonema is the first stage in the life cycle of mosses, which are bryophytes.
- It develops directly from the spore.
- Protonema is characterized as a creeping, green, branched, and often filamentous structure.
- Importantly, protonema is a haploid structure, meaning it has one set of chromosomes (n).

2. **Understanding Prothallus**:
- Prothallus is the gametophyte stage in pteridophytes (ferns).
- It arises from the germination of haploid spores.
- Prothallus is a small, inconspicuous, and multicellular structure.
- Like protonema, prothallus is also haploid, having one set of chromosomes (n).

3. **Conclusion**:
- Since both protonema and prothallus are haploid structures, the correct answer to the question is that both are haploid.

### Final Answer:
Protonema and prothallus are respectively: **Haploid and Haploid**.

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