Effect of osmosis and sugar concentration on the mass of plant tissue: practical | Combined science

Starter quiz

Which part of the plant cell is the selectively-permeable cell membrane?

A

B ✓

C

D
The net movement of water molecules through a selectively-permeable membrane is called …

active transport

circulation

osmosis ✓

reaction
When there are more water molecules on one side of a selectively-permeable membrane than the other, this creates a ______ gradient.

'concentration' ✓
The net movement of water molecules through the membrane will be …

… from side A to side B. ✓

… from side B to side A.

… equal in both directions.
The net movement of water molecules through the membrane will be …

… from the concentrated solution to the dilute solution.

… from the dilute solution to the concentrated solution. ✓

… equal in both directions.
Which prediction is correct?

The cell will gain water. ✓

The cell will lose water.

The cell will neither gain nor lose water.

When potato chips are placed in sugar solution, they gain and lose water from the solution due to the process of ______.

'osmosis' ✓
When investigating the effect of sugar solution concentration on potato chips, why were the test tubes placed in a water bath?

to control the concentration of the solutions

to measure the concentration of the solutions

to control the temperature of the solutions ✓

to measure the temperature of the solutions
When investigating the effect of sugar solution concentration on potato chips, what is the independent variable?

the concentration of the sugar solution ✓

the mass and length of the potato chips

the number of potato chips in each solution

the temperature of the solutions
When investigating the effect of sugar solution concentration on potato chips, what is the dependent variable?

the concentration of the sugar solution

the mass and length of the potato chips ✓

the number of potato chips in each solution

the temperature of the solutions
At which concentration did the potato chip increase in mass?

0.25 mol/dm $^3$ ✓

0.50 mol/dm $^3$

0.75 mol/dm $^3$

1.00 mol/dm $^3$
Which concentration caused the potato chips to take in water by osmosis?

0.25 mol/dm $^3$ ✓

0.50 mol/dm $^3$

0.75 mol/dm $^3$

1.00 mol/dm $^3$

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Water diffuses into and out of cells by osmosis; net movement is from a more dilute solution to a more concentrated one.
Investigating the effect of sucrose solution concentration on the mass of potato chips.
Use of appropriate apparatus to measure volumes, masses and times accurately.
Safe use of materials and apparatus.
Control of variables that might affect the results (e.g. temperature).

Coordinating the measurements and the sugar solution in this practical is fiddly and if not done methodically, the results can be easily confused.

The table in which results will be recorded is clearly labelled and used, and a copy is provided in the worksheet.

Osmosis - the net movement of water molecules through a selectively-permeable membrane from a dilute solution to a concentrated one
Net movement - the overall movement of particles
Mass - a measure of how much matter something contains, in grams
Control - a variable which is kept constant between all experiments