Ijmb Model Questions Vol1 2021 Biology Question 4

Practice practical question 4 from the 2021 Ijmb Model Questions Vol1 Biology examination. This question covers Cellular respiration, Temperature effect on enzyme activity, Gas collection and calculation of respiration rate .

Ijmb Model Questions Vol1 2021 Biology Practical
Topics: Cellular respiration Temperature effect on enzyme activity Gas collection and calculation of respiration rate
Question 4 IJMB_MODEL_QUESTIONS_VOL1 • 2021 • BIOLOGY • practical

A student investigates the effect of temperature on the rate of respiration in germinating wheat grains using a closed respirometer containing potassium hydroxide to absorb the CO₂ evolved.

Question Parts

( a )
Using the data below, calculate the respiration rate in millilitres of CO₂ per gram of wheat per minute for each temperature. Temperature (°C) : 15, 25, 35, 45, 55 Volume of gas collected after 30 min (mL) : 12.0, 18.5, 25.0, 28.0, 27.5 Mass of wheat grains in each respirometer = 5 g.
( b )
State the temperature at which the respiration rate is maximal and give the corresponding rate.
( c )
Explain why the respiration rate declines at 55 °C despite the temperature increase.
( d )
Suggest one procedural modification that could improve the accuracy of the respiration measurements and justify your suggestion.

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About This Question

This is Ijmb Model Questions Vol1 2021 Biology Question 4. It is one of the practical questions from the 2021 Ijmb Model Questions Vol1 Biology examination.

The question covers Cellular respiration, Temperature effect on enzyme activity, Gas collection and calculation of respiration rate .

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