Standard Science Primary 5 Systems

A ring of bark was removed from a plant stem, including the food-carrying tubes. After some time, a swelling was observed above the ring. What caused this?

A The roots were producing too much food.
B Food made in the leaves could not reach the roots.
C The plant was taking in too much minerals.
D Water could not reach the leaves.
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Worked Solution

Step 1: Leaves make food via photosynthesis. Step 2: Food is transported downwards to the roots via phloem (food-carrying tubes). Step 3: Removing the phloem causes food to accumulate above the cut, resulting in swelling.

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

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