which of the following is long lived and dominant phrase of life cycle of club fungi?

Options

A. primary mycelium
B. secondary mycelium
C. monokaryotic mycelium
D. both (1) &(2)

Answer

To solve the question about which phase is long-lived and dominant in the life cycle of club fungi (Basidiomycetes), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Classification**: Recognize that club fungi belong to the class Basidiomycetes. This is important because it helps us understand their life cycle and the phases involved.

2. **Identify the Phases**: The life cycle of club fungi includes three main phases:
- Monokaryotic mycelium
- Primary mycelium
- Secondary mycelium

3. **Analyze Each Phase**:
- **Monokaryotic Mycelium**: This phase is characterized by having one nucleus per cell. It is the shortest phase in the life cycle.
- **Primary Mycelium**: This phase is haploid and serves as an intermediate stage. It is formed from the fusion of monokaryotic mycelium.
- **Secondary Mycelium**: This phase is formed when two different monokaryotic mycelia fuse together. It is dikaryotic (having two nuclei per cell) and is the long-lived and dominant phase of the life cycle.

4. **Determine the Long-Lived Phase**: Among these phases, the secondary mycelium is the longest-lived and dominant phase. It persists for a significant period and is crucial for the reproduction of club fungi.

5. **Select the Correct Answer**: Based on the analysis, the correct answer to the question is **secondary mycelium**.

### Final Answer:
The long-lived and dominant phase of the life cycle of club fungi is **secondary mycelium**.

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