Advanced Science Primary 5 Systems

Tim removed an outer ring of a plant stem, completely removing the food-carrying tubes but leaving the inner water-carrying tubes intact. What will most likely happen to the roots after a few weeks?

A The roots will grow longer and thicker.
B The roots will start making their own food.
C The roots will die because they cannot receive food.
D The roots will die because they cannot get water.
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Worked Solution

Step 1: Food-carrying tubes transport food from the leaves down to the rest of the plant, including the roots. Step 2: By cutting the outer ring, this pathway is broken. Step 3: The roots cannot photosynthesise. Without food reaching them, they will eventually die.

Correct answer: The roots will die because they cannot receive food.

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