What substance is added to grapes to bring about frementation??
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Answer: The substance added is Yeast.
Explanation: Yeast is a single celled organism which when added to any product containing sugar or fermentable sugar, converts it into ethanol and Carbon dioxide.
Ethanol is a form of alcohol. Grapes are a rich source of fermentable sugars, hence on adding yeast to it and preserving it in appropriate conditions, wine is formed.
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