Advanced Science Primary 6 Energy

An experiment was set up to measure the rate of photosynthesis by counting bubbles. If the lamp is moved further from the plant, what will happen to the bubble count?

A The count increases because there is more light.
B The count decreases because temperature increases.
C The count decreases because light intensity is lower.
D The count stays the same because water is constant.
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Worked Solution

Step 1: Identify the independent variable (distance of lamp/light intensity). Step [2-9]: Relate light intensity to the rate of photosynthesis. Step [2-9]: Further distance = lower light = slower photosynthesis = fewer oxygen bubbles.

Correct answer: The count decreases because light intensity is lower.

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