The zygospore of Spirogyra produces

Options

A. Four meiospores
B. A single filament
C. Four filament
D. A large number of spores each of which produces a filament.

Answer

To solve the question "The zygospore of Spirogyra produces," we can follow these steps:

### Step-by-Step Solution:

1. **Understand Spirogyra**:
- Spirogyra is a green filamentous algae found in freshwater. It belongs to the division Chlorophyta and is characterized by its spirally arranged chloroplasts.

2. **Reproduction in Spirogyra**:
- Spirogyra reproduces sexually by the fusion of male and female gametes. This fusion results in the formation of a zygospore.

3. **Formation of Zygospore**:
- The zygospore is a diploid structure formed after fertilization.

4. **Meiosis in Zygospore**:
- The zygospore undergoes meiosis, which results in the formation of four haploid nuclei.

5. **Degeneration of Nuclei**:
- Out of the four haploid nuclei formed, three degenerate, leaving only one viable haploid nucleus.

6. **Development of Filament**:
- The remaining haploid nucleus develops into a single filament of Spirogyra.

7. **Conclusion**:
- Therefore, the correct answer to the question is that the zygospore of Spirogyra produces a single filament.

### Final Answer:
The zygospore of Spirogyra produces a **single filament**.

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