Diffusion and Osmosis
- Created by: IrishEllie98
- Created on: 11-06-14 18:02
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- B4
- Diffusion
- The net movement of particles in a gas or a liquid from and area of high to low concentration resulting in a random movement of the particles
- This explains how water, oxygen, and carbon dioxide can enter and leave cells through the cell membrane
- Leaves are adapted to increase the rate of diffusion of CO2 and O2 by having:
- Large surface area
- spaced out special openings called the stomata
- Gaps between the spongy mesophyll cells
- Diffusion is not a fixed quantity. It can be increased by...
- A shorter distance for the molecules to travel
- A steeper concentration gradient
- Greater Concentration Gradient = greater difference in concentration between 2 areas
- A greater surface area for the molecules to diffuse from or into
- The net movement of particles in a gas or a liquid from and area of high to low concentration resulting in a random movement of the particles
- Osmosis
- A type of diffusion
- Depends on the presence of a partially permeable membrane
- That allows the passage of water molecules, but not large molecules such as glucose
- Osmosis is the movement of water across a partially permeable membrane from an area of high water concentration (dilute solution) to an area of low water concentration (concentrated solution)
- Osmosis is the consequence of the random moving water molecules, which is not restricted by a partially permeable membrane
- The net movement of water molecules will be from one were there is very many to one where there are very few
- Diffusion
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