GCSE Biology - Osmosis #8

The video tutorial explains osmosis, a special case of diffusion involving water molecules moving across a partially permeable membrane from higher to lower water concentration. It clarifies the concept of water concentration, comparing it to solute concentration, and demonstrates this with beaker examples. Finally, it applies these concepts to cellular environments, showing how water moves into cells due to concentration differences.

What is the primary difference between diffusion and osmosis?

• Diffusion involves gases, while osmosis involves liquids.

• Diffusion is the movement of particles, while osmosis is the movement of water molecules.

• Diffusion requires energy, while osmosis does not.

• Diffusion occurs in solids, while osmosis occurs in gases.

How is water concentration defined in the context of osmosis?

• The total volume of water present.

• The number of water molecules compared to solute molecules.

• The temperature of the water.

• The pH level of the water.

In the context of osmosis, what is a partially permeable membrane?

• A membrane that allows only solutes to pass through.

• A membrane that allows all substances to pass through.

• A membrane that blocks all substances.

• A membrane that allows only water molecules to pass through.

What happens to water molecules when there is a higher concentration of solutes outside a cell?

• Water molecules evaporate.

• Water molecules move out of the cell.

• Water molecules remain stationary.

• Water molecules move into the cell.

Why does water move into a cell during osmosis?

• Because the cell has a higher water concentration.

• Because the cell has a lower water concentration.

• Because the cell is warmer.

• Because the cell is cooler.