06 Jan
2016
Tuition Centre Singapore Biology Tuition – Movement of Substances (Diffusion)
Tuition Centre Singapore Biology Tuition – Movement of Substances (Diffusion)
Common Error 1
Diffusion of particles from one region to another takes place at a constant speed.
Correct Concept 1
The concentration gradient determines the speed of diffusion. As diffusion proceeds, the concentration gradient decreases. The speed of diffusion thus decreases as well
Common Error 2
During diffusion, particles only move in the direction of the region of lower concentration.
Correct Concept 2
Particles move randomly in all directions. The net movement of particles is in the direction of the region of lower concentration
Common Error 3
Each cell is a self-contained unit of life.
Correct Concept 3
Cells interact with other cells in a network of communication. There are many examples where substances, like carbon dioxide, diffuse through the leaf from cell to cell before exiting into the atmosphere
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