Standard Science Primary 5 Systems

A ring of bark was removed from a tree, including the phloem but leaving the xylem intact. After a few weeks, a swelling appeared above the ring. Why?

A The tree was producing too much sugar.
B Food could not reach the roots.
C The xylem was damaged.
D Water could not reach the leaves.
Show Worked Solution

Worked Solution

Step 1: Removing bark removes the phloem. Step 2: Phloem carries food from leaves to roots. Step 3: Since the path was blocked, food accumulated above the ring, causing swelling.

Correct answer: Food could not reach the roots.

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