Standard Science Primary 5 Systems

Siti removed a ring of the outer stem from a plant, including the food-carrying tubes, but left the water-carrying tubes intact. After a week, she noticed a swelling above the ringed part. Which of the following explains this?

A The plant could not carry out photosynthesis.
B Food made by the leaves could not reach the roots.
C The roots could not absorb water.
D Water could not reach the leaves.
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Worked Solution

Step 1: Identify that the food-carrying tubes (phloem) were removed. Step 2: Food is made in the leaves and transported downwards to the roots. Step 3: If the phloem is removed, food accumulates above the cut, causing swelling.

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

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