Waec Model Questions Vol1 2024 Biology Question 4

Practice practical question 4 from the 2024 Waec Model Questions Vol1 Biology examination. This question covers Respiration .

Waec Model Questions Vol1 2024 Biology Practical
Topic: Respiration
Question 4 WAEC_MODEL_QUESTIONS_VOL1 • 2024 • BIOLOGY • practical

A group of students investigates the effect of temperature on the rate of respiration in germinating mung beans using a closed‑system manometer. Ten healthy mung beans are placed in a 250 mL sealed container connected to a U‑tube manometer filled with water. The initial water column difference is recorded as 0 cm. The container is then placed in a water bath set at a chosen temperature and the change in the water column is noted every minute for 6 minutes. The experiment is repeated at 20 °C, 30 °C and 40 °C. The recorded total rise in the water column after 6 minutes at each temperature is: 20 °C – 2.4 cm, 30 °C – 4.8 cm, 40 °C – 6.0 cm. The density of water is 1.00 g cm⁻³ and 1 L of O₂ at STP occupies 22.4 L.

Question Parts

( a )
Explain why the rise in the water column of the manometer indicates the rate of respiration of the beans.
( b )
Calculate the volume of CO₂ (in mL) produced by the beans at each temperature after the 6‑minute period. (Assume the change in water column directly reflects the change in gas volume.)
( c )
Determine the respiration rate (mL CO₂ min⁻¹) at each temperature.
( d )
Using the respiration rates at 20 °C (R₁) and 30 °C (R₂), calculate the Q₁₀ value for this temperature interval. State what the Q₁₀ value indicates about the temperature sensitivity of respiration in mung beans.
( e )
Suggest two experimental improvements that would increase the reliability of the respiration rate measurements.

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About This Question

This is Waec Model Questions Vol1 2024 Biology Question 4. It is one of the practical questions from the 2024 Waec Model Questions Vol1 Biology examination.

The question covers Respiration .

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