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BioFlow

Transport in flowering plants · O-Level Biology

Conditions

✂️ Ring-barking experiment

Remove a ring of bark (with the phloem) near the base of the stem. The xylem, deeper inside, is left intact.

Created by Mr Lau Chin Hang

🏫 @curiominds.inc · ▶ YouTube · 🌐 Website

Water in xylem

Water vapour

Sucrose

Amino acids

Tap any part of the plant

🔬 Inside a leaf cross-section

Water lost
transpiration0mm/min

Water absorbed
potometer reading0mm/min

Stomata open

Water vapour gradient

Water in cells (turgor)

Sucrose export
from leaves0a.u.

Photosynthesis
in leaves0%

Supply to bud

Supply to fruit

Supply to roots

🧪 Potometer measures water uptake · time ×30

📈 Rate over time last 60 s

🧠 Why?