LABORATORY REVIEW
TRANSPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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they were the same
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the one in the dark turned clear
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the one in the light became clear
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Detailed explanation-1: -In the dark, an elodea plant will turn a bromothymol blue solution yellow as it produces carbon dioxide as a product of respiration. An elodea plant exposed to light will turn yellow bromothymol blue back to the blue color as it uses carbon dioxide.
Detailed explanation-2: -The plant is undergoing cellular respiration and is consuming oxygen. A plant in darkness will consume oxygen when it conducts aerobic cellular respiration using glucose reserves, and new oxygen is not produced because photosynthesis is not occurring.
Detailed explanation-3: -The experiment proved that if the light source was too far away, photosynthesis would be slower and less productive. The procedure was to place Elodea under heat lamps and count the bubbles of photosynthesis in test tubes. A higher count of bubbles showed a higher rate of photosynthesis.
Detailed explanation-4: -The tube exposed to light turned a darker green to blue depending on the amount of exposure time. This occurred because the Elodea photosynthesized, using up the carbon dioxide in the solution.