Direction: Two beakers A and B contain plain water and concentrated s...
In beaker B, raisins will Shrink because water concentration is less outside the cell membrane, so more water comes out of the membrane than enters.
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Direction: Two beakers A and B contain plain water and concentrated s...
**Explanation:**
When raisins are placed in a liquid, they undergo a process called osmosis. Osmosis is the movement of water molecules from an area of lower concentration to an area of higher concentration through a semi-permeable membrane.
In this case, beaker A contains plain water and beaker B contains a concentrated sugar solution. The concentration of water molecules is higher in beaker A compared to beaker B. Therefore, water molecules will move from beaker A to beaker B through the raisins in an attempt to equalize the concentration.
**Swell:**
When water molecules move into the raisins, they will absorb the water and swell. This is because the raisins have a lower concentration of water compared to the surrounding liquid.
**Shrink:**
On the other hand, when water molecules move out of the raisins, they will lose water and shrink. This is because the raisins have a higher concentration of water compared to the surrounding liquid.
**Remain the same:**
If the concentration of water inside the raisins is already equal to the concentration of water in the surrounding liquid, there will be no net movement of water molecules and the raisins will remain the same size.
**First shrink and then swell:**
In some cases, the raisins may initially shrink as water molecules move out of the raisins to equalize the concentration. However, as the concentration of water inside the raisins decreases, the concentration gradient between the raisins and the surrounding liquid decreases. Eventually, water molecules may start moving into the raisins, causing them to swell.
Therefore, in beaker B containing the concentrated sugar solution, the raisins will initially shrink as water molecules move out of the raisins to equalize the concentration. However, as the concentration gradient decreases, the raisins may start absorbing water and swell. Thus, the correct answer is option B: Shrink.
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