Which is wrong

Options

A. Sporangiospores of Rhizopus are diploid
B. Rhizopus belongs to zygomycetes
C. Dominant phase of chlamydomonas is haploid
D. zoospores of chlamydomonas are haploid.

Answer

To determine which statement is incorrect among the options provided, we will analyze each statement step by step.

### Step-by-Step Solution:

1. **Analyze the first statement: "Sporangiospores of Rhizopus are diploid."**
- Rhizopus is a genus of fungi that reproduces through sporangiospores. These spores are produced in a structure called a sporangium.
- The sporangium is a haploid structure, meaning it contains a single set of chromosomes (n).
- Therefore, the sporangiospores produced in the sporangium are also haploid (n), not diploid (2n).
- **Conclusion**: This statement is incorrect.

2. **Analyze the second statement: "Rhizopus belongs to Zygomycetes."**
- Rhizopus is indeed classified under the division Zygomycetes, which is characterized by the formation of zygospores during sexual reproduction.
- **Conclusion**: This statement is correct.

3. **Analyze the third statement: "Dominant phase of Chlamydomonas is diploid."**
- Chlamydomonas is a green alga that exhibits a haplontic life cycle, meaning the dominant phase is the haploid gametophyte.
- The diploid phase (sporophyte) is transient and occurs only during the zygote stage.
- **Conclusion**: This statement is incorrect.

4. **Analyze the fourth statement: "Zoospores of Chlamydomonas are diploid."**
- Zoospores are produced by Chlamydomonas during asexual reproduction and are haploid (n).
- They are motile spores that swim using flagella.
- **Conclusion**: This statement is incorrect.

### Final Conclusion:
The incorrect statements are:
- "Sporangiospores of Rhizopus are diploid."
- "Dominant phase of Chlamydomonas is diploid."
- "Zoospores of Chlamydomonas are diploid."

However, the question specifically asks for one wrong statement, and the most straightforward answer based on the provided information is that **"Sporangiospores of Rhizopus are diploid"** is the most clearly incorrect statement.