The effect of temperature on the metabolic rate of a snail was investigated using the respirometer shown. The experiment was carried out at 10°C, 15°C, 20°C and 25°C. At each temperature, the tap was left open for 15 minutes then closed and readings were taken from the scale every 2 minutes. Identify how the dependent variable was measured.

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The effect of temperature on the metabolic rate of a snail was investigated using the respirometer shown - Scottish Highers Biology - Question 11 - 2019

Question 11

The effect of temperature on the metabolic rate of a snail was investigated using the respirometer shown. The experiment was carried out at 10°C, 15°C, 20°C and 25°... show full transcript

Worked Solution & Example Answer:The effect of temperature on the metabolic rate of a snail was investigated using the respirometer shown - Scottish Highers Biology - Question 11 - 2019

Step 1

C Carbon dioxide production

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Answer

The dependent variable in this experiment is carbon dioxide production. This is measured by observing the change in the level of the colored liquid in the respirometer over time. As the snail's metabolic rate increases with temperature, it produces more carbon dioxide, which would be indicated by a change in the liquid's level. Therefore, the primary measurement reflects the metabolic activity of the snail through its carbon dioxide output.

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