Standard Science Primary 5 Systems

A ring of bark was removed from a plant stem at position X. After two weeks, a swelling was observed ABOVE position X. This is because __________.

A water cannot reach the leaves
B minerals are trapped at the top
C food made by leaves cannot reach the roots
D the plant is producing more fruits
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Worked Solution

Step 1: Removing bark removes the phloem (food-carrying tubes). Step 2: The xylem (water-carrying tubes) remains intact in the center. Step 3: Food made in the leaves travels down but gets stuck at the cut (X). Step 4: This accumulation causes the swelling above the cut.

Correct answer: food made by leaves cannot reach the roots

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