A) The xylem sap will flow out.
B) Xylem sap will accumulate at cut surface.
C) The cut surface will form air bubbles, when placed in water.
D) Air will be pulled into the xylem.
Correct Answer: D
Solution :
[d] If the stem of plant is cut under a state of tension in xylem sap, the air will be pulled into the xylem and the transport of water (xylem sap) remains in continuity. However, it can be discontinued with the introduction of air bubble in the xylem. Copeland (1902) believed that air bubbles enter into the xylem and break the tensile strength or cohesion force between the water molecules.
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