Biology CH: 13 Diffusion and Osmosis

Question 1

What is selectively permeable membrane?

Answer 1

A selective permeable membrane allows some but not all molecules to pass through

Question 2

what is Diffusion?

Answer 2

1) Diffusion is the spreading out of molecules from a region of high concentration to a region of low concentration
Ex: * CO2 diffusing into a leaf, Oxygen diffusing out of a leaf.
* Oxygen diffusing from the blood into a cell and CO2 diffusing out of a cell.

2) Diffusion is caused by the kinetic energy of the molecules.
3) Diffusion is said to be passive

Question 3

What is Osmosis?

Answer 3

1) Osmosis is the movement is water molecules across a semi-permeable membrane from a region of high water concentration to a region of low water concentration.

2) Osmosis is said to be passive

Question 4

What is a Solvent?

Answer 4

Is a liquid that dissolves other substances
Ex: Water is a biological solvent

Question 5

What is a solute?

Answer 5

Is a substance that has been dissolved
Ex: Salt

Question 6

What is a solute?

Answer 6

Is a substance that has been dissolved
Ex: Salt

Question 7

What is a solution?

Answer 7

Is a mixture of a solute and solvent
Ex: salt and water

Question 8

Osmosis and Animals