Study TipsJune 10, 20264 min read
MDCAT Plant Transport — Xylem & Phloem 2026
Premeth Team
Meth Experts
Plant transport: xylem moves water up; phloem moves sugars bidirectionally.
Xylem (Water Transport)
- Vessels + tracheids; dead, lignified
- Transpiration pull (cohesion-tension theory)
- Root pressure (less significant in tall plants)
- Stomatal control via guard cells
Phloem (Sugar Transport)
- Sieve tube elements + companion cells; living
- Mass flow hypothesis (Munch)
- Source-to-sink transport
- Bidirectional (xylem is one-way up)
Related Tags
#MDCAT#Biology#Plants
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