As an undergraduate research assistant in the lab of the famous Dr.S.Nameerf,your duties involve measuring water potential in experimental soil-plant-atmosphere systems.Assume you make a series of measurements in a system under normal daylight conditions,with stomata open and photosynthesis occurring.Which of the following correctly depicts the trend your measurement data should follow if the cohesion-tension mechanism is operating?

Question

Quizplus · Accepted Answer

The cohesion-tension mechanism is responsible for the movement of water from the roots to the leaves via the xylem. The water potential should be highest at the soil (where water is taken up) and lowest at the atmosphere (where water is lost through transpiration). Therefore, the correct trend should be ψatmosphere < ψleaves < ψroots < ψsoil. This is represented by option D.

As an Undergraduate Research Assistant in the Lab of the Famous