Alexa removed an outer ring of stem from a potted plant, as shown in the diagram. After a week, what will happen to the part of the stem immediately ABOVE the cut?
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Worked Solution
Step 1: Removing the outer ring removes the food-carrying tubes (phloem).
Step 2: The leaves above the cut continue to make food during photosynthesis.
Step 3: This food cannot be transported downwards past the cut.
Step 4: The accumulated food causes the stem immediately above the cut to swell.
Correct answer: It will swell.
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