Single-celled animals that live in fresh water have a vacuole that contracts regularly to remove excess water. Single-celled plants that live in fresh water do not have a similar vacuole.
Which statement explains why only these animals need this vacuole?
1 )
Plant cell cytoplasm and animal cell cytoplasm both have a lower water potential than fresh water.
2 )
Plant cell sap has the same water potential as fresh water, animal cytoplasm has a lower water potential than fresh water.
3 )
Plant cell walls are impermeable to water, animal cell surface membranes are permeable to water.
Plant cell walls restrict the entry of water, animal cell membranes allow the free entry of water.
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