Question

Which of the following is not a common use for spent yeast?

1.Compost for apple orchards
2.Making marmite or vegemite
3.Food for animals
4.Product for using in the fermentation stages prior to distillation

Answer 1

The not common use for spent yeast among the provided options is as a 'Product for using in the fermentation stages prior to distillation'. Spent yeast is generally not suitable for initiating new fermentation processes as its quality and effectiveness may be reduced after previous use.

Step-by-step explanation:

The student has asked which of the following uses is not common for spent yeast:

1. Compost for apple orchards
2. Making marmite or vegemite
3. Food for animals
4. Product for using in the fermentation stages prior to distillation

Yeast, specifically Saccharomyces cerevisiae, is widely known for its role in various fermentation processes such as baking bread, brewing beer, and making wine. After these fermentation processes, the spent yeast can be recycled and has various common uses. However, it is not commonly used in new fermentation stages prior to distillation because the desirable qualities of yeast necessary for effective fermentation may have diminished. Instead, fresh yeast or specific strains are typically used for consistent and controlled fermentation results.

Thus, the correct answer to the question is option 4: Product for using in the fermentation stages prior to distillation.