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Freshwater amoeba in salt water will have a higher solute content outside of the amoeba. The water in the amoeba will want to move out of the amoeba and into the environment. This will cause the amoeba to shrivel and die.

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An amoeba dies in salt water due to osmosis. Salt water has a higher concentration of salt compared to the amoeba's internal environment, causing water to be drawn out of the amoeba, leading to dehydration and ultimately death.

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Q: Why would an Amoeba die if placed in salt water?
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Why does water move into the amoeba living in fresh water?

Water moves into the amoeba living in fresh water through the process of osmosis, where water molecules move from an area of high water concentration (outside the amoeba) to an area of lower water concentration (inside the amoeba). This helps the amoeba maintain its internal balance of water and nutrients.


Why would you expect a freshwater amoeba to be more likely to have contractile vacuoles than a marine amoeba?

A freshwater amoeba is more likely to have contractile vacuoles because it needs a mechanism to regulate its internal water balance in a hypoosmotic environment like freshwater where water constantly enters its cell by osmosis, whereas a marine amoeba inhabiting a hyperosmotic environment does not face the same water influx issue.


What would happen to a cheek cell if it was placed in a petri dish full of salt water?

The cheek cell placed in salt water would undergo a process called plasmolysis, where water leaves the cell due to the hypertonic environment. This would cause the cell to shrink and become dehydrated. Ultimately, the cell may die due to the loss of water and cellular functions not being able to occur properly.


What happen in an egg when it placed in a salt solution?

When an egg is placed in a salt solution, water inside the egg moves out towards the higher concentration of salt in the solution through osmosis. This causes the egg to shrink and become smaller in size as water leaves the egg.


A Cell is placed in a salt solution whose concentration is greater than cell?

In this scenario, the salt solution is hypertonic compared to the cell. Water will move out of the cell through osmosis, causing the cell to shrink or shrivel up.