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Biology CBSE Live product
Class 8 (2025-26)
The Invisible Living World: Beyond our Naked Eye
Revision II - The Invisible Living World: Beyond our Naked Eye
8.
Lime water experiment
Question:
3
m.
Choose the most suitable answer from the choices below.
Why is lime water used in yeast fermentation experiments?
1.
What reaction occurs in lime water test?
The clear lime water turns milky or cloudy.
Yeast ferments sugar, breaking it down into alcohol and carbon dioxide.
Turns Lime water milky in presence of \(O_2\)
Calcium hydroxide reacts with carbon dioxide to form insoluble calcium carbonate.
2.
What observation shows the presence of \(CO_2\)?
Calcium hydroxide reacts with carbon dioxide to form insoluble calcium carbonate.
Turns Lime water milky in presence of \(O_2\)
The clear lime water turns milky or cloudy.
Yeast ferments sugar, breaking it down into alcohol and carbon dioxide.
3.
Why does yeast produce \(CO_2\) in sugar solution?
Turns Lime water milky in presence of \(O_2\)
Calcium hydroxide reacts with carbon dioxide to form insoluble calcium carbonate.
The clear lime water turns milky or cloudy.
Yeast ferments sugar, breaking it down into alcohol and carbon dioxide.
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