Many fresh water animals possess vacuoles which contract regularly, expelling excess water.
Why do plants living in fresh water not require such vacuoles?
1 )
Plant cell sap has a much lower concentration of dissolved solutes than animal cytoplasm.
2 )
Plant cell walls are impermeable to water.
The water potential is the same inside and outside the plant cells.
4 )
Water movement into plants is controlled by their roots.
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