Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

Turgor pressure is best expressed as the:

a. movement of water into a cell by osmosis.

b. driving force for osmotic movement of water (C).

c. group movement of large numbers of molecules because of adifference in pressure between two locations.

d. equivalent of water potential.

e. pressure exerted by fluid inside a plant cell against the cellwall.

Summary Introduction


The turgor pressure influences the movement of solutes and water throughout the cell and plant body. It contributes to the turgidity of the cell. The osmotic flow of water across influences the turgor pressure in the plant cells and also maintains the structure of the plant cell.


Explanation for the correct answer:

Option (e) is “turgor pressure is the force exerted by fluid onto the walls of the cells.” With the ongoing osmosis, water is driven into the plant cell and the swelling central vacuole pushes the plasma membrane to the cell wall. This fluid pressure generated by the incoming water is called turgor pressure. Hence, option (e) is the correct option.

Explanation for incorrect answer:

Option (a) is “turgor pressure is the movement of water through osmosis.” Movement of water into a cell by osmosis is due to the concentration gradient of the solute across the membrane of the plant cell. So, it is an incorrect option.

Option (b) is “turgor pressure is the driving force for osmotic water movement...

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