What is correct?
(a) Protonema of moss and prothallus of Dryopteris are sporophytic
(b) Protonema of mos and prothallus of Dryopteris are gametophytic
(c) Moss protonema is sporophytic, Pteris prothallus is gametophytic but plant body of Pteris and Funaria are gametophytic
(d) Plant body of moss is gametophytic while that of Dryopteris is both gametophytic and sporophytic

Options

A. Protonema of moss and prothallus of Dryopteris are sporophytic
B. Protonema of mos and prothallus of Dryopteris are gametophytic
C. Moss protonema is sporophytic, Pteris prothallus is gametophytic but plant body of Pteris and Funaria are gametophytic
D. Plant body of moss is gametophytic while that of Dryopteris is both gametophytic and sporophytic.

Answer

To determine the correct statement regarding the protonema of moss and the prothallus of Dryopteris, let's analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Protonema and Prothallus**:
- **Protonema**: This is the initial stage of moss development after a spore germinates. It consists of a chain of cells and is considered a gametophytic structure.
- **Prothallus**: This is the gametophyte stage of ferns like Dryopteris. It is also a gametophytic structure.

2. **Analyzing Option (a)**:
- States that both the protonema of moss and the prothallus of Dryopteris are sporophytic.
- **Evaluation**: Incorrect, as both structures are gametophytic.

3. **Analyzing Option (b)**:
- States that both the protonema of moss and the prothallus of Dryopteris are gametophytic.
- **Evaluation**: Correct, as both structures are indeed gametophytic.

4. **Analyzing Option (c)**:
- States that the moss protonema is sporophytic and the Pteris prothallus is gametophytic, but the plant body of Pteris and Funaria are gametophytic.
- **Evaluation**: Incorrect, as the moss protonema is gametophytic, not sporophytic.

5. **Analyzing Option (d)**:
- States that the plant body of moss is gametophytic while that of Dryopteris is both gametophytic and sporophytic.
- **Evaluation**: Incorrect, as the plant body of moss is gametophytic, but the plant body of Dryopteris is primarily sporophytic.

### Conclusion:
The only correct statement is **(b)**: Protonema of moss and prothallus of Dryopteris are gametophytic.