Diffusion and Osmosis in Potato Cells Pre-lab question: The accompanying graph s

Question

Diffusion and Osmosis in Potato Cells Pre-lab question: The accompanying graph shows the % change in weight of potato disks in several solutions with different sucrose concentrations as a function of time. Read these questions well, and submit the answers. (1 point each)

1) Rank the solutions in order of increasing sucrose concentration.

2) Is solution A isotonic, hypertonic or hypotonic to the potato disks? Explain.

3) Is solution B isotonic, hypertonic or hypotonic to solution C? Explain

4) What can you deduce about solution D relative to the potato disks?

5) How is the change in weight of the potato disks related to the solute concentration? Be clear and comprehensive in your answer.

Behavior of Potato Cells in Solutions of Unknown Osmolarities. 20 T 15 -10 Solution A Solution B 60 -Solution C 40 10 Solution D -15 -20 -25 -30. time in minutes

Explanation / Answer

Ans1)solution C>solutionB>solutionD>solution A

On the basis of concentration.

Ans2)Solution A is hypotonic to potato disc because the weight of potato disc increases when kept in solution A.This means that solutiln A is hypotonic for potato disc and water enters in the disc to increase its weight.

Ans3)Solution B is hypotonic to solution C because % change in weight of disc in C is greater than solution B.

Ans4)The solution D is isotonic to potato disc because their is no significant change in weight of disc when kept in solution D

Ans5)More the solute in solution lesser will be increase in weight of potato disc when kept in that solution.This is because as more and more solute is added the solution becomes more and more hypertonic.It may even become so hypertonic that the weight of potato may even decrease.

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