Grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. Under what conditions do these grapes ferment? Is it a chemical or a physical change?

Grapes on the plant do not ferment because of the defense mechanism of plants.

When grapes are plucked from the plant, grapes react with yeast to carry out fermentation. Here, sugar changes to alcohol, hence, it is a chemical change.


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