cohesion-tension theory

Question 1

describe water movement through a plant?

Answer 1

water enters via the root
Water enters a plant’s root hair cells via osmosis.
It moves through the cell cytoplasm or cell walls towards the xylem.
The xylem transports water from the roots up to the leaves.

Question 2

explain cohesion

Answer 2

Hydrogen bonding causes water molecules to stick together and move as one continuous column.

Question 3

explain adhesion

Answer 3

Hydrogen bonding between polar water molecules and non-polar cellulose in xylem vessel walls pulls water upwards through the xylem.

Question 4

explain transpiration pull?

Answer 4

Evaporation of water at leaves creates the transpiration pull, and this tension is transmitted down the whole water column due to cohesion.