Exam 34: Transport in Plants

Protoplasts are wall-free plant cells that can be produced in the lab by enzymatic digestion of the walls.Why are protoplasts more delicate than intact plant cells when they are placed in solutions of different concentrations?

Water enters the roots of plants as a result of _______ pressure.

Capillary action is a force that

The transpiration-cohesion-tension mechanism explains how

Unlike xylem cells, phloem transport cells are

The movement of a solution due to a difference in pressure potential between two parts of a plant is called _______.

Tension is negative

Whereas tension is the result of pulling on a water column, _______ is the force that allows water to be pulled from the veins into the apoplast.

According to the cohesiontensiontranspiration model of water movement, cohesion plays the most significant role in

Stomata are essential for balancing the need to retain water with the need

What is the primary reason for plants closing their stomata when it gets dark?

Stripping bark completely around the circumference of a tree is called _______.As a result of this action, the remaining bark swells _______ the area from which the bark was removed.

What happens when a large amount of water enters a plant cell?

Which part of the plant would offer the most nutrition to a grazing animal?

A cell has a pressure potential (_p) of +1.5 MPa and a solute potential (_s) of +1.5 MPa.What does this mean for the resulting value of  and the flow of water, provided the cell is in a bath of pure water ?

The _______ across the cell membrane enables ions to move against their concentration gradient.

Which of the following would be considered a reasonable long-term strategy for a tree at the onset of a drought?

Water initially enters the roots by

The endodermis of the root has a waxy, suberized

If the water potential on both sides of a permeable membrane is _______, there will be no net movement of water.