Standard Science Primary 5 Systems

A ring of bark was removed from a plant stem at position X. After two weeks, a swelling was observed above position X. What caused this swelling?

A The plant is storing excess water.
B Water cannot be transported to the leaves.
C Food cannot be transported to the roots.
D The xylem tubes were removed.
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Worked Solution

Step 1: The bark contains phloem, which transports food from leaves downwards. Step 2: Removing a ring of bark breaks the phloem path. Step 3: Food made by leaves gets trapped above the cut. Step 4: This accumulation causes the swelling.

Correct answer: Food cannot be transported to the roots.

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