Advanced Science Primary 5 Systems

A ring of bark was removed from a plant stem. After one week, a swelling was observed above the ring. What does this indicate?

A Food cannot move downwards.
B Water cannot move upwards.
C The plant has stopped growing.
D Minerals are trapped in the leaves.
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Worked Solution

Step 1: Bark contains the phloem (food-carrying tubes). Step 2: Removing a ring of bark removes the phloem. Step 3: Food made in leaves moves down the phloem to the roots. Step 4: Since the path is blocked, food accumulates above the ring, causing swelling.

Correct answer: Food cannot move downwards.

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