How does concentration affect water potential?
In tuber cells i.e. potato cells, how does the concentration of a solute like sucrose affect the water potential and osmosis. For example, if the conc. of sucrose is increased what would happen and why? What scientific theories are involved?
Answers:
The water potential of pure water is defined as 0. Adding any solute makes the water potential negative. The more solute that is added, the more negative the water potential will become.
In osmosis, water moves from a less negative to a more negative water potential. Increasing the sucrose concentration in a tuber cell ought to increase the uptake of water, but it is not that simple because the water potential of plant cells depends upon both the solute concentration and the pressure exerted by the cell wall.
As the cell absorbs water, the pressure exerted by the wall increases. Eventually it will prevent the uptake of any more water and the cell will be turgid and have a water potential of 0.How does a cloud know when to release rain?
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Answers:
The water potential of pure water is defined as 0. Adding any solute makes the water potential negative. The more solute that is added, the more negative the water potential will become.
In osmosis, water moves from a less negative to a more negative water potential. Increasing the sucrose concentration in a tuber cell ought to increase the uptake of water, but it is not that simple because the water potential of plant cells depends upon both the solute concentration and the pressure exerted by the cell wall.
As the cell absorbs water, the pressure exerted by the wall increases. Eventually it will prevent the uptake of any more water and the cell will be turgid and have a water potential of 0.