An asexual spore produced by a sac fungus is called :

Options

A. conidium
B. ascospore
C. basidiospore
D. hypha

Explanation

To solve the question "An asexual spore produced by a sac fungus is called:", we will analyze each of the provided options step by step.

### Step 1: Understand the Types of Spores
We need to identify the types of spores associated with sac fungi (Ascomycetes). Sac fungi produce both asexual and sexual spores.

**Hint:** Remember that sac fungi are known for producing ascospores and conidia.

### Step 2: Analyze the Options
We have four options to consider: conidium, ascospores, basidiospores, and hypha.

1. **Conidium**:
- Conidia are asexual spores produced by sac fungi. They are formed at the tips of specialized structures called conidiophores.
- This option seems promising as it directly relates to asexual reproduction in sac fungi.

**Hint:** Think about the structures that produce asexual spores in fungi.

2. **Ascospores**:
- Ascospores are the sexual spores produced by sac fungi. They are formed within a sac-like structure called an ascus.
- Since the question asks for an asexual spore, this option is incorrect.

**Hint:** Focus on the difference between sexual and asexual spores.

3. **Basidiospores**:
- Basidiospores are produced by basidiomycetes (not sac fungi) and are formed on a structure called a basidium.
- This option is also incorrect as it does not pertain to sac fungi.

**Hint:** Recall the classification of fungi and the specific types of spores they produce.

4. **Hypha**:
- Hyphae are the filamentous structures that make up the body of fungi. They are involved in vegetative growth but are not spores.
- This option is incorrect as it does not refer to any type of spore.

**Hint:** Distinguish between structures that are part of the fungal body and those that are reproductive.

### Step 3: Conclusion
After analyzing all the options, we can conclude that the correct answer is **conidium**, as it is the asexual spore produced by sac fungi.

### Final Answer:
The asexual spore produced by a sac fungus is called **conidium**.

---