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Bio Lab - 1 Introduction a If my hypothesis that as plant...

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1) Introduction a) If my hypothesis, that as plant species evolved for survival in different habitats, their cells’ internal solute concentrations became different is true then the isotonic point for fresh water and terrestrial plants should be lower than salt water. My hypothesis makes sense because if all plants are thought to have evolved from a common ancestor-single-celled green algae living in the ocean. By evolving, cells internal salt concentrations must have evolved as well. Different habitats calls for different internal salt concentrations because if all plants had the same internal salt water concentration, then when they moved to different habitats that had different salt water concentrations then cells would become either plasmolyzed or turgid. For example if all plants had an internal salt concentration of 4% and which was good for a certain environment that the algae lived in. Later on a different species evolved from that algae and moved to a lake where the salt water concentration was 2%. Being that the internal salt concentration was 4% and external salt concentration was 2%, the plant cell would become turgid. Or in an environment that was 7% salt concentration the plant cell would become plasmolyzed and would probably die.
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