the net movement of water molecules through a selectively-permeable membrane from a dilute solution to a concentrated one

a measure of how much matter something contains, in grams

a variable which is kept constant between all experiments

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

Combined science

Effect of osmosis and sugar concentration on the mass of plant tissue: analysis

The importance of maintaining constant conditions in the body

Pupils will learn about factors that affect the rate of photosynthesis in plants, including temperature, light intensity and carbon dioxide concentration.

Pupils learned how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of plants, and about factors affecting the rate of water uptake by a plant.

This unit covers the importance of maintaining a constant internal environment, focusing on body temperature control, osmotic balance, and kidney function. It explains the roles of the skin, kidneys, and ADH, and emphasises data extraction, experiment techniques, and accurate data interpretation.

Coordination and control: maintaining a constant internal environment

Physical activity and equipment requiring safe use

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

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, why were the test tubes placed in a water bath?

the number of potato chips in each solution

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

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

At which concentration did the potato chip increase in mass?

Which concentration caused the potato chips to take in water by osmosis?

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

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

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

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.

The cell will neither gain nor lose water.

Starter Quiz

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