The juvenile stage of the gametophyte of moss is

Options

A. Green, filamentous and branched structure called protonema
B. A tetraflagellate body
C. Dorsoventrally flattened plate like body
D. A colourless mass of tubular structures.

Answer

To solve the question regarding the juvenile stage of the gametophyte of moss, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**:
- The question asks about the juvenile stage of the gametophyte of mosses. Mosses belong to the group known as bryophytes.

2. **Identify the Structure**:
- In mosses, the gametophyte is the dominant phase of the life cycle and is haploid. The juvenile stage of the gametophyte is characterized by specific structures.

3. **Know the Stages of the Gametophyte**:
- The gametophyte stage in mosses has two main parts:
- **Protonema Stage**: This is the juvenile stage.
- **Leafy Stage**: This follows the protonema stage.

4. **Characteristics of Protonema**:
- The protonema is described as:
- Green
- Filamentous
- Branched
- These characteristics help in identifying the protonema stage as the juvenile stage of the gametophyte.

5. **Evaluate the Options**:
- The options given are:
1. Green filamentous and branched structure called protonema (Correct)
2. A tetraflagellate body (Incorrect)
3. Dorsal ventrally flattened plate-like body (Incorrect)
4. A colorless mass of tubular structures (Incorrect)
- Based on the characteristics of the protonema, the correct answer is the first option.

6. **Conclusion**:
- Therefore, the juvenile stage of the gametophyte of moss is the green filamentous and branched structure called protonema.

### Final Answer:
The juvenile stage of the gametophyte of moss is the green filamentous and branched structure called protonema.

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