Advanced Science Primary 5 Systems

A ring of bark containing the phloem was removed from a tree trunk. After several weeks, the stem above the ring became swollen. Why did this happen?

A Food produced by leaves could not reach the roots.
B Water accumulated above the ring.
C The tree was producing more bark to heal.
D Air was trapped in the stem.
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Worked Solution

Step 1: Phloem transports food from leaves downwards. Step [2-9]: Removing the ring of phloem blocks this path. Step [2-9]: Food accumulates above the cut, causing the swelling.

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

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