In the context of the water cycle, what biological rate is evaluated using a potometer in a laboratory?

Correct answer: Rate of water uptake or transpiration by a plant

Correct answer: B. A potometer is an apparatus used mainly to estimate the rate at which a cut shoot takes up water. In a typical setup, the shoot is connected to a water-filled capillary tube, and movement of an air bubble or water column is observed over time. The rate of uptake is commonly used as an approximate indicator of transpiration rate because water absorbed by the shoot largely replaces water lost as vapour through the stomata. Strictly speaking, the instrument measures water uptake directly, not every molecule of water transpired; some water may be used in tissues or stored. A concerns evaporation from a non-living surface, while C concerns movement through soil or rock. D is measured with humidity instruments, not a potometer. Memory cue: “poto” reminds you of a potted or shoot system taking up water.