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Life Processes in Plants — Science STD 7 — Question

Gujarat BoardEnglish MediumSTD 7ScienceLife Processes in Plants5 Marks
Question
With the help of an experiment, explain that carbon dioxide is released during respiration.
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Answer

1.Take a small test tube containing lime water.
2.Place a small amount of germinating seeds in a conical flask and cover it with a cotton plug.
3.Connect the flask to the test tube with tubing so that air exhaled or released from seeds passes into the lime water.
4.Keep the setup for some time.
Observation: The lime water turns milky, indicating the presence of carbon dioxide.
Conclusion: This shows that germinating seeds respire and release carbon dioxide, which reacts with lime water to produce calcium carbonate, making the water milky. This experiment demonstrates that carbon dioxide is a byproduct of respiration in living organisms.

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