Standard Science Primary 5 Systems

Siti removed a ring of bark from a branch of a hibiscus plant. After two weeks, she noticed a swelling above the ringed part. Which of the following explains this?

A Food-carrying tubes were removed, so food made by the leaves accumulated above the ring.
B Water-carrying tubes were removed, so water accumulated above the ring.
C The plant was trying to grow new leaves at the swelling.
D Bacteria infected the wound and caused it to swell.
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Worked Solution

Step 1: The bark contains the phloem (food-carrying tubes). Step 2: Leaves above the ring produce food via photosynthesis. Step 3: Food travels down but is blocked at the ringed section. Step 4: Accumulation of food causes the tissue above the ring to swell.

Correct answer: Food-carrying tubes were removed, so food made by the leaves accumulated above the ring.

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