Gce Model Questions Vol1 2023 Biology Question 5

A flowering plant (species *Impatiens walleriana*) is grown in a greenhouse where temperature, humidity and light intensity can be controlled. The plant is well‑watered and allowed to develop a healthy root system. The researcher wishes to investigate how water is transported from the roots to the leaves and how environmental factors influence the rate of transpiration. The following data were recorded for a fully expanded leaf under two different conditions: | Condition | Light intensity (µmol m⁻² s⁻¹) | Relative humidity (%) | Measured transpiration rate (g H₂O h⁻¹ leaf⁻¹) | |-----------|------------------------------|-----------------------|--------------------------------------------| | A | 200 | 60 | 0.45 | | B | 800 | 30 | 1.20 | Using the information above, answer the following questions: