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In Activity 5.2, potassium hydroxide is placed near one potted plant under a bell jar mainly to:

Question
In Activity 5.2, potassium hydroxide is placed near one potted plant under a bell jar mainly to:
Provide extra oxygen
Absorb carbon dioxide from the enclosed air
Increase humidity
Kill bacteria
Answer
Absorb carbon dioxide from the enclosed air
Detailed Explanation
Potassium hydroxide absorbs carbon dioxide, so the plant kept with it will lack CO2 for photosynthesis, allowing comparison of starch formation.
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