Effect of Osmosis on Plant Cells Required Practical Flashcards
(4 cards)
1
Q
describe the method for investigating the effect of omosis on plant cells
A
- peel potato, potato skin can affect osmosis
- use a cork borer, create three cylinders of potato, using a cork borer ensures all the cylinders are the same diameter
-use a scalpel to trim the cylinders to the same length - measure the length of each cylinder using a ruler and the mass of each cylinder using an electric balance
- place each cylinder into a test tube
-add 10cm3 of a 0.5 molar sugar solution to the first test tube - add 10cm3 of a 0.25 molar sugar solution to the second test tube
- add 10cm3 of distilled water to the third test tube
- leave potato cylinders overnight
- remove potato culinders and gently pat them to remove any excess surface moisture
- record length with a ruler and mass with an electric balance again
2
Q
how do you calculate percentage change
A
% change = change in value/ original value x 100
3
Q
what happens to the potato cylinder in the water
A
it gains mass as water moves into it by osmosis
4
Q
what happens to the potato cylinder in a concentrated sugar solution
A
it loses masss as water moves out by osmosis
