Neco 2025 Biology Question 4

In a laboratory investigation the rate of respiration of germinating mung bean seeds was measured using a closed‑system manometer. Five fresh mung bean seeds were placed in a 250 mL airtight flask containing 20 mL of distilled water. The flask was connected to a U‑tube manometer filled with water. At the start of the experiment the water level in both arms of the manometer was the same (0 cm). After 10 minutes the water column rose 12 cm in the left arm at 30 °C and 18 cm in the right arm at 40 °C. The temperature of the water bath was maintained constant during each trial. The conversion factor for the set‑up is 1 cm water column = 0.98 mL of CO₂ gas at the experimental temperature and pressure. Answer the following questions: