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A de-shelled egg is placed in tap water. The egg grows in size.

What is the best explanation for this change in size?


Ions in the water moved into the cell through diffusion because there were more ions outside the cell than inside the cell.

Water moved into the cell by osmosis because the solute concentration was higher inside the cell than outside the cell.

Water moved out of the cell by osmosis because the solute concentration was higher outside the cell than inside the cell.

Water moved into the cell by diffusion because there is more water inside the cell than outside the cell.

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marianaegarciaperedo

The best explanation for the change in the egg's size is that Water moved into the cell by osmosis because the solute concentration was higher inside the cell than outside the cell. Option B.

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When talking about solutions, we can classify them as follows,

  • Hypertonic ⇒ A hypertonic solution has a higher concentration of solute than the cell. This means that in the cell interior, the solute concentration is lower than in the solution itself.  

  • Isotonic ⇒ The solute concentration is the same inside the cell and outside.  

  • Hypotonic ⇒ A hypotonic solution has a lower concentration of solute than the cell. This means that in the cell interior, the solute concentration is higher than in the solution itself.  

Water is considered to be a hypotonic solution.

When a cell is in a hypotonic solution, through osmosis, water moves toward the cell.  

Note: In this example, the egg is the cell.

Osmosis is the phenomenon that occurs when two dilutions of different concentrations -in this example, the interior of the cell and the solution- are separated by a semipermeable membrane.

The membrane allows the pass of water but not solute. Hence, water can move from the most diluted side to the less diluted one.  

Water tends to go from the hypotonic solution to the cell interior and keeps doing so until concentrations are equal in the cell interior and exterior.

As water enters the cell, the cell begins to enlarge and becomes bigger-sized. And because cells can not limit the amount of water moving in, it keeps swelling until the membrane can not stretch anymore, and lysis occurs. It bursts.  

What we need to consider is

  • When a cell with a semipermeable membrane is placed in a hypotonic solution, water enters the cell.

  • When a cell with a semipermeable membrane is placed in an isotonic solution, there is no water movement.  

  • When a cell with a semipermeable membrane is placed in a hypertonic solution, water gets out of the cell.

So, the best explanation for the change in the egg's size is Water moved into the cell by osmosis because the solute concentration was higher inside the cell than outside the cell. Option B.

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