Diffusion , Osmosis and Active Transport

Diffusion is the passive overall movement of particles from a region of their higher concentration to a region of their lower concentration.

When plants photosynthesis they use up co2 from the atmosphere and produce o2. This gases pass in and out of plant leaves by diffusion.

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

Is just a membrane that only allows certain substances to diffuse through. For example it normally only lets small molecules like water through and acts like a barrier to larger molecules like sucrose. The concentrated solution of sucrose becomes more dilute as the water tries to even out the concentration.

Active transport is the overall movement of chemicals across a cell membrane from a region lower concentrad to a region of higher concentration (the gradiant of movement is opposite to diffusion) using energy released by respiration.