Standard Science Primary 4 Systems

Siti removed a ring of bark from a stem, taking away the food-carrying tubes. Which observation is most likely after one week?

A The stem above the cut will swell.
B The leaves will wilt immediately.
C The flowers will turn white.
D The roots will grow faster.
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Worked Solution

Step 1: Removing the bark removes the phloem (food-carrying tubes). Step [2-9]: Food made in the leaves cannot move down past the cut. Step [2-9]: Food accumulates above the cut, causing the stem to swell.

Correct answer: The stem above the cut will swell.

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