Chaper 2 - Diffusion

Question 1

What do cells need?

Answer 1

Nutrients
Salts
Water
To get rid of waste such as carbon dioxide.

Question 2

Substances pass through a cell by?

Answer 2

3 main processes called diffusion, osmosis, active transport.

Question 3

What is diffusion?

Answer 3

Diffusion is the movement of molecules from high concentration to low concentration in gasses, liquids and dissolved substances.

Question 4

Lots of molecules = low concentration. True or false?

Answer 4

False.

Question 5

What is the equilibrium?

Answer 5

Diffusion occurs until they’ve become equal.

Question 6

The higher the temperature and greater surface area the . .

Answer 6

Faster diffusion will take place.

Question 7

Microvilli are?

Answer 7

Microvilli are found in the liver and kidneys and increase the absorbing surface area.

Question 8

Why would a smaller cube have a larger surface area compared to its volume?

Answer 8

It can be compared to an amoeba. Since it has a large surface area compared to volume, it can take up everything it needs just by diffusion alone whilst a big cube cannot have its needs carried out by diffusion alone due to the layers.