Advanced Science Primary 5 Systems

Jun Jie removed a ring of bark from the stem of a plant, which included the food-carrying tubes but NOT the water-carrying tubes. After one week, he noticed a swelling ABOVE the ringed part. Why?

A The plant was not getting enough sunlight.
B Water could not reach the leaves.
C The roots could not absorb water.
D Food made in the leaves could not reach the roots.
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Worked Solution

Step 1: Food-carrying tubes (phloem) transport food from leaves downwards. Step 2: If the phloem is removed, food accumulates above the cut. Step 3: This accumulation causes the stem to swell.

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

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