Advanced Science Primary 5 Systems

A ring of bark was removed from a plant stem at part X. After a week, a swelling was observed above part X. Which statement explains this?

A The roots stopped taking in water.
B Food-carrying tubes were removed, so food collected above X.
C The plant grew faster to repair the damage.
D Water-carrying tubes were removed, so water collected above X.
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Worked Solution

Step 1: Ringing bark removes the phloem (food-carrying tubes) but leaves the xylem (water-carrying tubes) intact. Step 2: Food made in the leaves travels down. Step 3: Since phloem is gone at X, food accumulates above it, causing a swell.

Correct answer: Food-carrying tubes were removed, so food collected above X.

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