Here's why:

* No organelles required: Fermentation is an anaerobic process, meaning it doesn't require oxygen. This means it doesn't need the help of specialized organelles like mitochondria, which are involved in aerobic respiration.

* Enzymes in the cytoplasm: The enzymes responsible for fermentation are located within the cytoplasm of the cell, where they can access the necessary molecules (like glucose) and carry out the chemical reactions.

While fermentation doesn't directly involve mitochondria, it's important to note that it often follows glycolysis, which does occur in the cytoplasm and produces pyruvate, the starting material for fermentation.