Explain Cohesion-Tension Theory

Transpiration of water through stomata creates low potential at the top of the xylem. Water molecules stick together via hydrogen bonds in a process known as COHESION. This occurs because water molecules are polar with a 𝛿+ and 𝛿- end. Water is then pulled up the xylem creating TENSION. It is as though water molecules are "sucked" up to the leaves (like a straw).

JM
Answered by Joanne M. Biology tutor

9809 Views

See similar Biology A Level tutors

Related Biology A Level answers

All answers ▸

Describe the function of enzymes DNA helicase and DNA polymerase during DNA replication (2 marks)


What are the functions of the cell membrane?


What is the Biuret test? How do I interpret the results?


Describe what happens when an action potential reaches an axon terminal.


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

MyTutor is part of the IXL family of brands:

© 2025 by IXL Learning