Select the odd one w.r.t. sexual spore in fungi?

Options

A. Oospores
B. Oidia
C. Basidiospores
D. Ascospores

Answer

To solve the question "Select the odd one with respect to sexual spores in fungi," we need to analyze the different types of fungi and their respective sexual spores.

### Step-by-Step Solution:

1. **Identify the Groups of Fungi**:
- The main groups of fungi are Phycomycetes, Ascomycetes, Basidiomycetes, and Deuteromycetes.

2. **Understand Sexual Reproduction in Fungi**:
- **Phycomycetes**: They produce sexual spores called zygospores. They are also known as lower fungi.
- **Ascomycetes**: Known as sac fungi, they produce sexual spores called ascospores, which are formed in structures called asci.
- **Basidiomycetes**: They produce sexual spores known as basidiospores, formed on basidia.
- **Deuteromycetes**: Also known as imperfect fungi, they do not reproduce sexually and therefore do not produce sexual spores.

3. **Identify the Odd One Out**:
- Among the four groups, Deuteromycetes is the only group that does not produce sexual spores. This makes it the odd one out with respect to sexual reproduction.

4. **Conclusion**:
- The correct answer is Deuteromycetes, as it is the only group that does not have a sexual reproduction stage and thus lacks sexual spores.

### Final Answer:
The odd one with respect to sexual spores in fungi is **Deuteromycetes**.