Practice!

Sample Problem

Which of the following forces allow water to pulled up the stem without expending energy?

(A) transpiration

(B) cohesion tension

(C) water pressure from the roots

(D) translocation

Solution

(A), (B), and (C) are correct. These three forces work together to provide an upwards pulling and pushing motion. (D) Translocation refers to the process of circulation within plants. It’s not a force.