In which of the following stage of Rhizopus 'n' number of chromosome is not found?

Options

A. Zygospore
B. Hypha
C. Sporangium
D. Spore

Answer

To solve the question regarding the stage of Rhizopus in which 'n' number of chromosomes is not found, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Options**: We are given four options:
- Zygospore
- Hypha
- Sporangium
- Spore

2. **Identify Chromosome Numbers**:
- In fungi, the 'n' represents the haploid number of chromosomes, while '2n' represents the diploid number.
- We need to determine which of the stages listed does not exhibit the haploid number of chromosomes.

3. **Analyze Each Stage**:
- **Zygospore**: This is formed during sexual reproduction and is a diploid structure (2n). Therefore, it does not have the haploid number of chromosomes.
- **Hypha**: This structure can contain several haploid nuclei, so it does have the 'n' number of chromosomes.
- **Sporangium**: This is involved in producing spores, which are haploid (n).
- **Spore**: Spores are typically haploid (n) and are produced by meiosis.

4. **Conclusion**: Based on the analysis, the zygospore is the only stage that does not have the haploid number of chromosomes (n) because it is diploid (2n).

5. **Final Answer**: The stage of Rhizopus in which 'n' number of chromosomes is not found is the **Zygospore**.