Standard Science Primary 5 Systems

A ring of bark was removed from a plant, including the food-carrying tubes. After a week, a swelling was observed above the ring. Why did this happen?

A Food made by the leaves could not reach the roots.
B Water could not reach the leaves.
C The roots were making too much food.
D The plant was absorbing too much water.
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Worked Solution

Step 1: Bark contains the phloem (food-carrying tubes). Step 2: Leaves produce food via photosynthesis. Step 3: Removing the ring blocks food from moving down to the roots. Step 4: Food accumulates above the ring, causing swelling.

Correct answer: Food made by the leaves could not reach the roots.

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