Igcse Model Questions Vol1 2019 Biology Question 4

Practice practical question 4 from the 2019 Igcse Model Questions Vol1 Biology examination. This question covers Respiration, Cellular respiration .

Igcse Model Questions Vol1 2019 Biology Practical

Topics: Respiration Cellular respiration

Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2019 • BIOLOGY • practical

A sealed respirometer containing five germinating beans was used to measure the rate of cellular respiration at three different temperatures. The volume of CO₂ collected over a period of 30 minutes was recorded as follows: | Temperature (°C) | CO₂ volume collected (ml) | |------------------|---------------------------| | 20 | 12.0 | | 30 | 24.0 | | 40 | 36.0 | Assume the gas collected is pure CO₂ and that the temperature of the gas remains constant during each measurement. Answer the questions below:

Question Parts

( a )

Calculate the rate of respiration (ml CO₂ h⁻¹) for each temperature.

( b )

Describe the relationship between temperature and the rate of respiration. State the type of graph you would draw and the expected shape of the curve.

( c )

Using the data for 20 °C and 30 °C, calculate the temperature coefficient Q₁₀ for the respiration process. (Formula: Q₁₀ = (R₂ / R₁) ^ [10 / (T₂ – T₁)])

( d )

Identify two possible sources of error in this experiment and explain how each could affect the measured rates of respiration.

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About This Question

This is Igcse Model Questions Vol1 2019 Biology Question 4. It is one of the practical questions from the 2019 Igcse Model Questions Vol1 Biology examination.

The question covers Respiration, Cellular respiration .

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