Standard Science Primary 5 Systems

A ring of bark was removed from a plant, including the food-carrying tubes. After some time, a swelling was observed ABOVE the ring. Why?

A The roots are producing too much food.
B The plant is storing extra water.
C Food made by the leaves is trapped above the ring.
D Water cannot reach the leaves.
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Worked Solution

Step 1: Food-carrying tubes (phloem) transport sugar from leaves to roots. Step 2: Removing the phloem stops the downward flow. Step 3: Food accumulates above the cut, causing the tissue to swell.

Correct answer: Food made by the leaves is trapped above the ring.

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