What Would Be an Easy Way to Turn a Grape Into a Raisin Soak the Grape in an Isotonic Solution
Selina Solutions Class 8 Biology Solutions for Exercise Long Answer Questions (LA) in Chapter 1 - Transportation in plants
Question 3 Long Answer Questions (LA)
Practice Question:
"Raisins swell in water, and grapes shrink in syrup." Explain this phenomenon briefly.
Answer:
Solution:
When we put some raisins in a bowl containing, and some soft-skinned grapes in another bowl containing thick syrup of sugar. After 10-12 hours we see raisins have absorbed water and swelled whereas the grapes have shrunken. This happened because of the peel acting like a semi-permeable membrane.
The experiment states that the peel over the raisins and that of grapes act as a semipermeable membrane. This membrane has very minute pores which allow water molecules to pass through but prevent the larger ones of sugar.
Video transcript
hi everyone welcome to little learning here we can see a practice question that is raisins swell in water and grapes shrink in syrup explain this phenomenon briefly okay so the phenomenon is given as raisins if you're putting them in water it swells up whereas grapes if you're putting it in syrup sugar syrup it shrinks right so how can you explain this phenomenon briefly so here i have placed a picture so here you can see that in a bowl some raisins are kept inside the water solution so inside water some raisins are kept and after 10 to 12 hours you can see that the raisins absorbs the water and they swell up whereas the graves it is placed in a strong solution of sugar so what happens after 10 to 12 hours the graves lose water so why is that happening here yes because the peel of the raisins and graves it acts as a semi-permeable membrane so here we can say that the raisins is put in a bowl of water and grapes it is put in a bowl of concentrated sugar syrup right so now what happens after 10 12 10 to 12 hours the raisins swell and the grapes shrink right so how this happens this happens because the peel acts as a semi-permeable membrane so what is the property of a semi-permeable membrane it allows the small particles to pass through the membrane right so here in the case of grapes or in the case of raisins if you are taking these membrane that is appeal will have very minute pores which allows the molecules to pass through and it prevents the larger molecules from passing through it so in the case of raisins the water concentration is more outside than inside the racing outside the racing and so what happens since the peel is a semi-permeable membrane the water diffuses into the tracing so that is why it swells up because water gets absorbed all right and what about the case of grapes in the case of grapes here also the peel is acting as a semi-permeable membrane but the grapes they are placed in in strong solution of sugar that is concentrated solution of sugar so the concentrations of sugar is more outside and the water concentration will be more inside the grapes so what happens the water starts moving from the grapes to the outside into the sugar solution and since it is having a semi-permeable membrane it does not allow the sugar which is larger molecules to come inside okay so in the case of grapes we can say that the peel prevents larger molecules of sugar to pass through and what happens the concentration of concentration of water is more inside the grapes when compared to the sugar solution and because of this water diffuses outside or diffuses to the sugar solution hence water diffuses into the sugar solution right and because of that the grapes lose water and thus the grapes lose water and they shrink okay so this is the main reason why the raisins if put in water swells up and graves which is put in concentrated sugar syrups shrink because the peel is acting as a semi permeable membrane and the diffusion takes place from a larger concentration to a lower concentration okay so this is a solution for this question if you have any doubt regarding this comment below and do subscribe to this channel for getting regular updates thank you
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