Igcse Model Questions Vol1 2018 Biology Question 4

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

Igcse Model Questions Vol1 2018 Biology Practical
Topic: Respiration
Question 4 IGCSE_MODEL_QUESTIONS_VOL1 • 2018 • BIOLOGY • practical

Students measured the rate of respiration of germinating broad‑bean (Vicia faba) seeds using the soda‑lime method. Three sets of five seeds each were placed in sealed chambers kept at different temperatures: 25 °C, 35 °C and 45 °C. The volume of carbon dioxide absorbed by the soda‑lime (in millilitres) over a 5‑minute period was recorded for each trial. The results are shown below. | Temperature (°C) | Trial 1 | Trial 2 | Trial 3 | Trial 4 | Trial 5 | |------------------|---------|---------|---------|---------|---------| | 25 | 12 | 13 | 11 | 14 | 12 | | 35 | 20 | 22 | 19 | 21 | 20 | | 45 | 25 | 27 | 26 | 28 | 27 | Using the data, answer the following questions.

Question Parts

( a )
For each temperature, calculate the average rate of respiration in millilitres of CO₂ per minute.
( b )
Calculate the percentage increase in the respiration rate when the temperature is raised from 25 °C to 35 °C, and from 35 °C to 45 °C.
( c )
Explain why the rate of respiration increases with temperature, referring to the role of enzymes.
( d )
Identify two possible sources of error that could affect the measured respiration rates.
( e )
Suggest one improvement to the experimental set‑up that would reduce the error(s) you mentioned in part (d).

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About This Question

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

The question covers Respiration .

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