When the flow of water is equal in and outside of the cell, is the cell called _______? 

This question was previously asked in
RPF SI (2018) Official Paper (Held On : 12 Jan 2019 Shift 2)
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  1. Flacid 
  2. Isotonic 
  3. Inflation Pressure
  4. Hypotonic

Answer (Detailed Solution Below)

Option 2 : Isotonic 
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Detailed Solution

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The correct answer is Isotonic.

Key Points

  • When the flow of water is equal inside and outside of the cell, the cell is said to be in an isotonic environment.
  • In an isotonic solution, the concentration of solutes is the same inside and outside the cell, which leads to no net movement of water across the cell membrane.
  • This balance of water movement helps maintain the cell's shape and function.

Additional Information

  • Hypotonic Solution
    • In a hypotonic solution, the concentration of solutes is lower outside the cell than inside the cell.
    • This causes water to enter the cell, potentially leading to cell swelling and even bursting.
  • Hypertonic Solution
    • In a hypertonic solution, the concentration of solutes is higher outside the cell than inside the cell.
    • This causes water to leave the cell, potentially leading to cell shrinkage and dehydration.
  • Flaccid 
    • In plant cells, a flaccid state typically occurs in a hypotonic environment when water flows out due to a lower solute concentration outside.
    • The rigid cell wall prevents bursting, but the cell loses turgor pressure and becomes limp.
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