Advanced Science Primary 5 Systems

A ring of bark was removed from a plant stem, as shown in the diagram. After a week, a swelling was observed above the ring. This is because __________.

A water cannot be transported up to the leaves
B food made by leaves cannot be transported to the roots
C the roots are absorbing too much water
D the plant has stopped making food
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Worked Solution

Step 1: Removing a ring of bark removes the phloem (food-carrying tubes). Step 2: Food made in leaves travels down to the roots. Step 3: The blockage at the ring causes food to accumulate, leading to swelling.

Correct answer: food made by leaves cannot be transported to the roots

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