Advanced Science Primary 5 Systems

Ravi removed the outer ring of the stem of a plant, taking away only the food-carrying tubes. After a few weeks, he observed a swelling above the cut. This happened because __________.

A air could not enter the stem
B food made by leaves could not travel to the roots
C the plant could not absorb minerals
D water could not travel to the leaves
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Worked Solution

Step 1: Food is made in the leaves and travels downwards through the phloem. Step [2-9]: Removing the outer ring (phloem) blocks the downward path. Step [2-9]: Food accumulates above the cut, causing the stem to swell.

Correct answer: food made by leaves could not travel to the roots

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