Standard Science Primary 5 Systems

A ring of bark was removed from the stem of a plant, as shown in the diagram. After a week, a swelling was observed above the ring. Why did this happen?

A The xylem was removed, so water could not reach the leaves.
B The phloem was removed, so food could not reach the roots.
C The plant was storing excess water in the stem.
D The plant was trying to grow new roots from the swelling.
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Worked Solution

Step 1: Bark contains the phloem (food-carrying tubes). Step 2: Food is made in the leaves and travels down to roots. Step 3: Removing the ring blocks the path, causing food to accumulate and swell above the cut.

Correct answer: The phloem was removed, so food could not reach the roots.

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