Differentiate between Ascus and basidium

Explanation

### Step-by-Step Solution

1. **Definition of Ascus**:
- An Ascus is a specialized structure found in fungi, specifically in the group known as Ascomycetes. It is typically spherical, cylindrical, or club-shaped.

2. **Function of Ascus**:
- The primary function of the Ascus is to facilitate the fusion of haploid cells. Following this fusion, the Ascus undergoes meiosis (reduction division), which is a type of cell division that reduces the chromosome number by half.

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