Consider the following investigation. A healthy plant is placed in a sealed container overnight when the plant is in darkness. The oxygen concentration in the trapped air is measured at the start of the night and again in the morning.Justify whether the oxygen concentration in the morning will be higher, lower or the same as at night.
Question
Consider the following investigation. A healthy plant is placed in a sealed container overnight when the plant is in darkness. The oxygen concentration in the trapped air is measured at the start of the night and again in the morning.Justify whether the oxygen concentration in the morning will be higher, lower or the same as at night.
Solution
During the day, plants photosynthesize, a process in which they take in carbon dioxide and release oxygen. However, at night, plants undergo a process called respiration where they take in oxygen and release carbon dioxide, because photosynthesis cannot occur without sunlight.
Step 1: Understand that during the day, plants perform photosynthesis where they absorb carbon dioxide and release oxygen.
Step 2: Understand that at night, plants perform respiration where they absorb oxygen and release carbon dioxide.
Step 3: Since the plant is in a sealed container, the oxygen that is absorbed by the plant at night cannot be replaced.
Step 4: Therefore, the oxygen concentration in the morning will be lower than it was at night because the plant has been absorbing oxygen all night for respiration and releasing carbon dioxide.
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