Understanding Osmosis & Diffusion

The video explains diffusion and osmosis, focusing on how molecules move from high to low concentration areas. It uses the example of red dye in water to illustrate diffusion and describes osmosis with glucose and water separated by a semi-permeable membrane. The role of cell membranes in allowing water and small molecules to passively diffuse while requiring energy for other substances is also covered.

What is the primary characteristic of diffusion?

• Movement from low to high concentration

• Movement from high to low concentration

• Movement requiring energy

• Movement of large molecules only

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

• A membrane that allows all molecules to pass through

• A membrane that allows only water molecules to pass through

• A membrane that blocks all molecules

• A membrane that allows glucose molecules to pass through

During osmosis, water moves towards which type of solution?

• A solution with lower solute concentration

• A solution with no solute

• A solution with higher solute concentration

• A solution with equal solute concentration

Why is osmosis crucial for living organisms?

• It requires energy to function

• It prevents any movement across cell membranes

• It enables the passive movement of water and small molecules

• It allows for the active transport of ions

What is the role of active transport in cells?

• To allow passive diffusion of water

• To block all molecules from entering the cell

• To move molecules against the concentration gradient using energy

• To enable energy-free movement of ions