Question

Why does the skin of your finger shrink when you wash your clothes for a long time?
A. Soap is hypotonic, So water moves out of fingers by osmosis.
B. Soap is hypertonic, So water moves out of fingers by osmosis.
C. Soap is isotonic, So water moves into fingers by osmosis.
D. Finger skin is very tender

Answer 1

Hint: Osmosis is the movement of solvent or water molecules from an area with a higher diffusion pressure or free energy to an area with a lower diffusion pressure or free energy through a semipermeable membrane.

Complete answer:
Let’s before answering the question learn about some points.
The direction and speed of osmosis depend on the sum of the two forces, the pressure gradient and the concentration gradient.
Hypotonic solution-If the extracellular solution has a lower concentration of solute than is present in the cell, the solution is called a hypotonic solution. When cells are placed in a hypotonic solution, the movement of water within the cells occurs due to endosmosis. The cell is in such a state that it swells and can even burst.
Hypertonic Solution -When the extracellular solution has a solute concentration higher than the concentration in the cell, it is called a hypertonic solution. The solution is the movement of water outside the cell, causing exosmosis. Cells shrink and lose the ability to divide and even function.
Isotonic solution- When the extracellular solution has the same concentration of solute as in the cell, it is called an isotonic solution. When the cell is placed in an isotonic solution, there is no movement of water across the cell membrane. In this case, the cell size is not affected because there is no moving water.
Now let’s come to the question
Soap contains a lot of solute and hence the solution is hypertonic than the water that is why during washing exocytosis occurs. That’s why water moves out of fingers.
So, the correct answer is “Option C”.

Note:
Osmotic pressure is also defined as “the hydrostatic pressure that occurs in a solution due to the osmotic flow of a solvent (such as water) when a solution is separated from the pure solvent(pure) with the help of a semipermeable membrane. The term osmotic pressure was coined by pepper. Osmotic pressure is measured in the atmosphere, in bars or Pascal’s. Instrument for measuring O.P. called eight meters.