Measuring Water Uptake Using a Potometer (AQA A-Level Biology): Flashcards

Apparatus used to measure rate of water uptake by plant shoots

99%

Prevents air entering xylem vessels

Seals joints to prevent air leaks

$\pi r^2 l$ ($r$=radius, $l$=bubble distance)

Increases (more evaporation)

Increases (steeper water potential gradient)

Increases (opens stomata for photosynthesis)

Increases (removes water vapour from leaf surfaces)

Measures uptake, indicates transpiration