A ring of bark was removed from the stem of a plant, as shown in the diagram. After a few days, a swelling was observed above the ringed part. This is because __________.
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Worked Solution
Step 1: The outer layer of the stem contains the food-carrying tubes (phloem).
Step 2: Removing a ring of bark removes the phloem but leaves the xylem (inner) intact.
Step 3: Food made in the leaves cannot reach the roots and accumulates above the cut, causing swelling.
Correct answer: food-carrying tubes were removed
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