A major difference between red blood cells and Elodea cells is that Elodea cells have a cell wall, which protects them from bursting.
True or False?
A.
True
B.
False
The Correct Answer and Explanation is:
A. True
The statement is correct. A major difference between red blood cells and Elodea cells is indeed the presence of a cell wall in Elodea cells, which protects them from bursting, unlike red blood cells.
Explanation:
Elodea cells are plant cells, and one of their distinctive features is the presence of a cell wall. The cell wall is a rigid, semi-permeable outer layer composed mainly of cellulose, which provides structural support and protection to the cell. It plays a crucial role in maintaining the cell’s shape and preventing excessive expansion under varying environmental conditions. This rigidity helps the cell withstand turgor pressure, the pressure exerted by the fluid inside the cell against the cell wall. When a plant cell is placed in a hypotonic solution (where the concentration of solutes outside the cell is lower than inside), water enters the cell by osmosis. The cell wall prevents the cell from bursting by providing a strong barrier against the internal pressure. As a result, Elodea cells remain intact and do not rupture easily, even in hypotonic environments.
In contrast, red blood cells (RBCs), or erythrocytes, do not have a cell wall. They are surrounded only by a flexible plasma membrane. The absence of a cell wall means that RBCs are more susceptible to changes in osmotic pressure. In a hypotonic solution, water enters RBCs more rapidly because there is no rigid wall to counteract the osmotic pressure. As the internal pressure increases, the flexible membrane can only stretch so far before it ruptures, leading to hemolysis, or the breaking of the red blood cells.
This difference in cellular structure highlights why plant cells, such as those of Elodea, are less prone to bursting under osmotic pressure compared to animal cells like red blood cells. The cell wall provides a protective function that helps maintain cell integrity in fluctuating environmental conditions.