A ring of bark was removed from a plant stem at point X, as shown in the diagram. After one week, a swelling was observed above point X. Which tubes were removed?
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Worked Solution
Step 1: Food is made in leaves and moves DOWN.
Step 2: Water is absorbed by roots and moves UP.
Step 3: Swelling above X means food is trapped and cannot move down.
Step 4: This indicates food-carrying tubes (phloem) were removed while water tubes (xylem) remained.
Correct answer: Only food-carrying tubes
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