In an experiment, a leaf was partially covered with black paper and left in the sun for 2 days. When tested with iodine, the covered part remained brown while the uncovered part turned dark blue. This shows that plants need __________ to make food.
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Worked Solution
Step 1: The covered part received no light and could not make starch (iodine stayed brown).
Step [2-9]: The uncovered part received light and made starch (iodine turned dark blue).
Step [2-9]: Conclusion: Light is necessary for photosynthesis.
Correct answer: Light
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