Observation of plasmolysis in a plant cell A. Which of the two micrographs shown
ID: 102407 • Letter: O
Question
Observation of plasmolysis in a plant cell A. Which of the two micrographs shown below is from the red onion epidermis cells before and which one is after the plasmolysis? Please label accordingly. Next, please label the cytoplasm and the nucleus on both images. B. To observe the plasmolysis with the red onion epidermis cells shown above, the specimen should be treated with a _____ (hypertonic or hypotonic) solution. C. What is meant by the terms hypertonic, hypotonic, and isotonic? Explain the expected results when animal cell is placed in a hypotonic?Explanation / Answer
A. 1st iamge is before plasmolysis, 2nd image is after plasmolysis.
B. To observe plasmolysis of red onion epidermis cells as shown above the specimen should be treated with a hypotonic solution.
C. The term ‘Hypertonic’ refers to a greater concentration. a hypertonic solution is one with a higher concentration of solutes outside the cell than inside the cell. When a cell is immersed into a hypertonic solution, the water will flow out of the cell in order to balance the concentration of the solutes.
The term ‘Hypotonic’ refers to a lesser concentration. A hypotonic solution has a lower concentration of solutes outside the cell than inside the cell, The water will rush into the cell, and can cause it to burst in an attempt to balance the concentrations of solutes inside and outside the cell.
In an isotonic solution the solute and solvent are equally distributed, which means it has same solute concentration as another solution. Here, the cell neither swells nor shrinks because there is no concentration gradient for water across the cell membrane.
Animal cells have flexible cell membranes which allow the cell to enlarge or shrink. This membrane also controls what enters and leaves the cell, and when the concentration of salts and other molecules in external fluid changes, the cells reacts by changing the inner concentration to match what's outside. So if the external solution becomes more dilute, or hypotonic, water will move into the cell until it balances the internal and external concentration. As a result, the cell enlarges, or swells. Such changes can be minor but if the change is severe, might damage or destroy the cell.
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