A student sets up an experiment to study human respiration using lime water, test tube and a straw. Lime water is colorless in absence of CO2 and is milky in its presence. When the student blows air through straw into lime water, it turns cloudy. What can be evaluated from it?Oxygen is exhaled during respiration.Water vapours are produced during respiration.Carbon dioxide is exhaled during respiration.Glucose is produced during respiration.
Question
A student sets up an experiment to study human respiration using lime water, test tube and a straw. Lime water is colorless in absence of CO2 and is milky in its presence. When the student blows air through straw into lime water, it turns cloudy. What can be evaluated from it?Oxygen is exhaled during respiration.Water vapours are produced during respiration.Carbon dioxide is exhaled during respiration.Glucose is produced during respiration.
Solution
The experiment demonstrates that Carbon dioxide is exhaled during respiration. Here's why:
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The student sets up the experiment with lime water in a test tube and a straw to blow air into the lime water.
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Lime water is known to be colorless in the absence of CO2 and turns milky or cloudy in the presence of CO2.
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When the student blows air (which is the exhaled breath) into the lime water, it turns cloudy.
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This change in color indicates the presence of CO2 in the exhaled breath.
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Therefore, it can be evaluated that Carbon dioxide is exhaled during respiration.
The other options - Oxygen is exhaled during respiration, Water vapours are produced during respiration, Glucose is produced during respiration - are not supported by this experiment.
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