Standard Science Primary 5 Systems

A ring of bark, including the food-carrying tubes, was removed from the stem of a plant. After a week, a swelling was observed above the ring. Why did this happen?

A The plant was unable to take in minerals from the soil.
B The roots were producing too much food.
C Water could not reach the leaves.
D Food made by the leaves was stuck above the ring.
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Worked Solution

Step 1: Removing bark removes the phloem (food-carrying tubes). Step 2: Food is made in the leaves and travels downwards to the roots. Step 3: The removed ring blocks the downward path. Step 4: Food accumulates at the blockage, causing the stem to swell.

Correct answer: Food made by the leaves was stuck above the ring.

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