Problem:

Transport through Xylem

a. Movement of fluid through the vascular tissue of plants is often expressed using water potentials. What does the negative sign tell you about a cell's water potential?

b. What two processes or events taking place in the plant generate the very negative water potentials typically observed in the leaves?

c. Horticulturists sometimes talk about harvesting xylem sap when the "sap is flowing." Identify two environmental conditions that could slow down or stop the flow of xylem sap through a tree.

d. The leading theory describing the movement of sap through xylem is call the cohesion-tension theory.

i. What does the cohesion part of the theory refer to (explain).

ii. What does the tension part of the theory refer to (explain).

Could someone help to explain the answer of these questions.