Advanced Science Primary 5 Systems

Ravi removed the food-carrying tubes from a ring of the stem of a plant but left the water-carrying tubes intact. After two weeks, he noticed the plant's roots were dying. Why?

A The roots could not carry out photosynthesis.
B The roots could not receive water from the leaves.
C The leaves could not receive food from the roots.
D The roots could not receive food from the leaves.
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Worked Solution

Step 1: Food-carrying tubes (phloem) transport sugar from leaves down to the roots. Step [2-9]: Removing them stops food from reaching the roots. Step [2-9]: Roots die because they cannot receive the energy needed to function.

Correct answer: The roots could not receive food from the leaves.

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