Answer:
If some solute is
dissolved in pure water, solution has fewer free water molecules and theconcentration
of water decreases, reducing its water potential.
Hence, all the
solutions have a lower water potential than pure water. The magnitude of
thislowering is due to dissolution of solute is called solute potential or 
is always
negative.
The more the
solute molecules, the lower (more negative) is the solute potential 
water potential
of a cell is affected by both solute and pressure potential.
The
relationship can be illustrated as
Where, 
water potential,
solute potential,
pressure
potential.
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