B2 - Diffusion and Osmosis

These cards cover topics including:

  • The movement of substances
  • Diffusion
  • Osmosis
HideShow resource information
  • Created by: Abigail
  • Created on: 03-04-11 14:58

The Movement of Substances

Cells have to constantly...

  • replace substances which are used up.
  • remove other substances.

 

Give an example for replacing substances and an example for removing substances.

1 of 16

Examples for Replacing Substances and removing sub

  • Replacing substances: food and/or oxygen.

 

  • Removing substances: carbon dioxide and waste products.
2 of 16

The Movement of Substances

These substances can pass into and out of cells by...

3 of 16

The Movement of Substances

  • Diffusion
  • Osmosis
4 of 16

Diffusion

What is diffusion?

5 of 16

Diffusion

Diffusion is the spreading of the particles of a gas, or any substance in solution, which results in a net movement from a region where they are at a higher concentration, to a region where they are at a lower concentration.

6 of 16

Diffusion

What passes through cell membranes by diffusion? And why?

7 of 16

Diffusion

Oxygen required for respiration passes through cell membranes by diffusion.

8 of 16

Diffusion

The greater the difference in concentration, the...

9 of 16

Diffusion

The greater the difference in concentration, the faster the rate of diffusion.

10 of 16

Osmosis

Osmosis is...

11 of 16

Osmosis

Osmosis is the movement of water from a dilute solution to a more concentrated solution through a partially permeable membrane.

12 of 16

Osmosis

The membrane allows...

13 of 16

Osmosis.

The membrane allows the passage of water molecules, but not solute molecules because they are too large.

14 of 16

Osmosis

Osmosis will gradually dilute the more concentrated solution. For example... 

15 of 16

Osmosis

For example, at root hair cells water moves from the soil into the cell by osmosis, along a concentration gradient.

16 of 16

Comments

Natasha

very helpful, thanks

~>>Anisah<<~

Thanks yeh..this is pretty good.

missfunkeytee

good stuff :)

anum

wow-sums up most of my notes on diffusion and stuff nice work! thnx

marina

really helpful

Similar Biology resources:

See all Biology resources »See all Exchange of materials resources »