Neco Model Questions Vol1 2018 Biology Question 4

Practice practical question 4 from the 2018 Neco Model Questions Vol1 Biology examination. This question covers Respiration .

Neco Model Questions Vol1 2018 Biology Practical

Topic: Respiration

Question 4 NECO_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

Students investigated the effect of temperature on the rate of cellular respiration in germinating mung bean seeds using a closed gas‑collection system. The volume of CO₂ produced after 10 minutes at each temperature is shown in the table. Rate of CO₂ evolution (control) | Temperature (°C) | Volume of CO₂ (mL) | |------------------|--------------------| | 20 | 12 | | 30 | 22 | | 40 | 35 | | 50 | 30 | Rate of CO₂ evolution (with cyanide inhibitor) | Temperature (°C) | Volume of CO₂ (mL) | |------------------|--------------------| | 20 | 5 | | 30 | 6 | | 40 | 7 | | 50 | 6 | Answer the following:

Question Parts

( a )

Calculate the rate of CO₂ evolution (in mL min⁻¹) for each temperature in both the control and the cyanide‑treated samples.

( b )

From the rates obtained, describe the trend with temperature for the control and explain at which temperature the maximum rate occurs.

( c )

Explain why the rate of respiration falls at 50 °C despite the higher temperature.

( d )

Identify two possible sources of experimental error in this investigation and suggest a method to minimise each error.

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About This Question

This is Neco Model Questions Vol1 2018 Biology Question 4. It is one of the practical questions from the 2018 Neco Model Questions Vol1 Biology examination.

The question covers Respiration .

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