Standard Science Primary 5 Systems

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

A The roots cannot absorb water anymore.
B Water cannot reach the leaves.
C The leaves have stopped making food.
D Food made by the leaves cannot reach the roots.
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Worked Solution

Step 1: Leaves make food via photosynthesis. Step 2: Food moves down to the rest of the plant through phloem. Step 3: Since the phloem was removed, food accumulates above the cut, causing swelling.

Correct answer: Food made by the leaves cannot reach the roots.

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