Question

When stomata are open and a plant is transpiring normally, how does water move from the soil into the root xylem? select all that apply.

Answer 1

When stomata are open and a plant is transpiring normally, movement of water from the soil into the root xylem is brought about by:-

• Pressure generated by roots which pumps water upwards in the plant.
• Without any additional work done on the fluid by the plant.
• Evaporation from the leaves in the form of transpiration.

In 1895, the Irish plant physiologists H. H. Dixon and J. Joly suggested that water is pulled up the plant by tension or negative pressure from above.

As water is continually being lost from the leaves through transpiration, Dixon and Joly concluded that the loss of water in the leaves exerts a pull on the water in the xylem ducts and draws more water into the leaf.

To learn more about transpiration here

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