Question

grapes hanging on the plant do not ferment but after being plucked from the plant can be fermented. under what condition do these grapes ferment? is it physical or chemical change. explain

Answer 1

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. This is a chemical change because a new substance is formed(wine) and it is irreversible.
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Answer 2

Answer:

Because grapes are alive when linked to plants, their own immune system prevents fermentation. The microorganisms can develop in the plucked grapes and ferment them under anaerobic conditions. This is a chemical transformation.

Explanation:

Why grapes don't ferment when attached to plants:

• When grapes are hanging from the plants, they are living in nature.
• Their immune system does not accept fermentation.
• The skin of grapes on the vine protects the fruit from bacteria and mould.
• Grapes also have lots of oxygen when they're on the vine, so fermentation isn't possible.

Fermentation of grapes when plucked:

• Because no oxygen reaches the cell when it is plucked, fermentation begins.
• They are fermented in the absence of oxygen in an anaerobic environment.
• Enzymes and temperature aid fermentation as well. A chemical change occurs when sugar transforms into alcohol.
• This is a chemical change because a new substance is formed (wine) and it is irreversible.