Discussion
Match the following products with their method of production :
| Column A | Column B |
|---|---|
| I. Beer | (a) Fermentation of grape juice with yeast |
| II. Wine | (b) Fermentation of malted grain and yeast |
| III. Vinegar | (c) Fermentation followed by distillation of ethanol |
| IV. Spirit | (d) Fermentation to produce ethanol followed by Acetobacter metabolism of ethanol |
Codes :
Answer: A
The correct matching is I-(b), II-(a), III-(d), IV-(c).
- Beer is made by fermenting malted grain (barley) with yeast.
- Wine is made by fermenting grape juice with yeast.
- Vinegar is made in two steps: yeast ferments sugar to ethanol, then Acetobacter oxidises the ethanol to acetic acid.
- Spirits such as whisky and rum are fermented and then distilled to concentrate the ethanol.
The other codes misplace at least two products, for example giving beer the distillation step, which belongs to spirits, or calling wine the acetic fermentation, which describes vinegar.
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