Evaluate the two proposed answers. Which are supported? I. Water entering the soil surface — the relevant process or measure: Carbon sink. II. Loss of water vapour from plant surfaces — the relevant process or measure: Transpiration.
Correct answer: B
I is incorrect: Water entering the soil surface → Infiltration. Its rate depends on soil and surface conditions. II is correct: Loss of water vapour from plant surfaces → Transpiration. Stomata are a major route of water loss.