Question

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?

Answer 1

Here is ur answer.

It is a chemical reaction since the grapes can't be obtained after fermentation

Answer 2

Grapes hanging from the plant do not ferment because they are still alive and their immune system  is still working. When they are plucked from the plant, their immune system stops working and hence,  they ferment. Under anaerobic condition microorganisms like yeast ferments grapes and wine is formed.