A ring of bark was removed from the stem of a plant, as shown in the diagram. After a week, a swelling was observed above the ringed part. Which transport tube was likely removed?
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Worked Solution
Step 1: Food-carrying tubes are located in the outer layer of the stem (bark).
Step 2: Removing a ring of bark removes the food-carrying tubes.
Step 3: Food made in the leaves cannot move down, causing it to accumulate and swell above the ring.
Correct answer: Food-carrying tubes
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