Advanced Science Primary 5 Systems

A ring of bark containing the food-carrying tubes was removed from the stem of a plant. What will be observed above the cut after two weeks?

A The stem above the cut will swell.
B The stem above the cut will wither and die.
C The roots will grow thicker.
D The leaves above the cut will turn yellow immediately.
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Worked Solution

Step 1: Leaves make food during photosynthesis. Step 2: This food is transported downwards through the food-carrying tubes (phloem) in the bark. Step 3: Removing the bark cuts off this pathway, causing the food to accumulate just above the cut, leading to a swelling.

Correct answer: The stem above the cut will swell.

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