How sexual reproduction occurs in cellular slime moulds ?

Explanation

### Step-by-Step Solution:

1. **Understanding Cellular Slime Moulds**: Cellular slime moulds belong to the kingdom Protista and exhibit unique characteristics, particularly during their vegetative phase, which consists of amoeboid cells.

2. **Mating Types**: In cellular slime moulds, there are two distinct mating types. For sexual reproduction to occur, cells of opposite mating types are required.

3. **Fusion of Cells**: The process begins when two amoeboid cells of opposite mating types come into contact and fuse together. This fusion results in the formation of a diploid cell.

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