In an experiment, a leaf was partially covered with black paper and placed in the sun for 24 hours. When tested with iodine solution, the covered part remained brown while the uncovered part turned dark blue. This proves that __________.
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Worked Solution
Step 1: The black paper blocked light from the covered part.
Step [2-9]: The covered part did not produce starch (remained brown).
Step [2-9]: Therefore, light is required for the plant to make food.
Correct answer: light is necessary for photosynthesis
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