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What effect different solutions, with the same water potential, have on potato and cucumber strips (by mass).
An extract from this essay...
What effect different solutions, with the same water potential, have
on potato and cucumber strips (by mass).
Plants in the soil have their roots in a dilute solution of various
mineral ions. Sometimes, the soil they are planted in gets flooded
with sea water (which has an average of 0.3 sodium chloride
concentration). In these cases the roots are observed to wilt and
become flaccid. In my experiment, I will simulate this situation using
potato and cucumber strips, placing them in different solutions
(sodium chloride, glucose and sucrose) at different molar
A substance dissolved in water is called a solute. A solvent is a
liquid that is able to dissolve another substance, a solute, to form a
Water potential is a measure of the ability of a solution to give out
water. Water potential (y) can be expressed as the sum of the solute
potential (ys) and the pressure potential (yp). (y) =
(ys) + (yp)
The water potential of pure water is zero and all other solutions have
a negative water potential. The greater the solute concentration, the
more negative is the value for water potential.
The water content of plants depends on environmental conditions. In
land plants, water plays a vital role in structural support and
mineral transport, thus, the lack of water may lead to wilting or
Water is mainly absorbed through the roots by Osmosis. Osmosis is the
diffusion of water molecules from and area of high water potential to
an area of low water potential through a partially permeable membrane.
The roots are covered in specially adapted
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