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

Water potential is:

a. the driving force for the osmotic movement of water intoplant cells.

b. higher in a solution that has more solute molecules relative towater molecules.

c. a measure of the physical pressure required to halt osmoticwater movement across a membrane.

d. a measure of the combined effects of a solution’s pressurepotential and its solute potential.

e. the functional equivalent of turgor pressure.

Summary Introduction


Osmosis is the process in which water moves across the semi-permeable membrane due to the concentration gradient. It is responsible for the short distance transport mechanisms across the plant cells. The underlying force for osmosis is the water potential, that is, the potential energy of the water.


Justification/explanation for the correct answer:

Option (d) states that the combine effect of solution and solute potential forms water potential. Water potential is produced due to the pressure and solute potential. Pressure potential is the physical pressure while solute potential is exerted due to the pressure of the solutes present in the water. The combined effect of the solute and pressure potential decides whether water will move out or into the cell. Hence, option (d) is correct.

Explanation for the incorrect answers:

Option (a) states that water potential is the main potential that leads to osmosis in the cell. Depending upon the value of the water potential based on both solute and pressure potential, water will either move out or into of the cell. So, it is an incorrect option.

Option (b) states that water potential is higher in solution having high solute concentration. Solute pressure is the pressure due to the presence of the solutes in the water...

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