Which one of the following is endogenously produced ?

Options

A. Ascospores
B. Basidiospores
C. Conidiospores
D. All of the above.

Answer

To determine which of the following spores is endogenously produced, we need to analyze each option provided:

1. **Ascospores**: These spores are produced internally within a structure called an ascus. This means they are formed inside a specialized sac-like structure, making them endogenously produced.

2. **Basidiospores**: These spores are produced externally on a structure called a basidium. They emerge as small outgrowths, which means they are not produced internally.

3. **Conidiospores**: These spores are produced externally on specialized mycelium known as conidiophores. Like basidiospores, they are not produced internally.

4. **All**: This option suggests that all the spores listed are endogenously produced, which is incorrect based on our analysis.

Based on the definitions and characteristics of each type of spore, we can conclude that the only endogenously produced spores among the options is **Ascospores**.

**Final Answer**: Ascospores