what is osmosis and difusion?

Answer 1

Diffusion is the process by which solutes move from an area of high solute concentration to an area of low solute concentration, such as small particles through the phospholipid bilayer. Osmosis is the same, just water, or solvents, moving from an area of high water potential to an area of low water potential. Both of these process also do not require any source of energy like ATP to complete.

Answer 2

Diffusion occurs because of the random movement of molecules, so that a system decays towards uniform conditions. Thus, when you put sugar into coffee, the sugar diffuses to all parts of the cup instead of staying in a lump. If there is any kind of a barrier, the object can move through it freely. Physical conditions, including the temperature, the size and shape of the molecule diffusing,and the concentration gradient can affect the diffusion.
Now, osmosis is a special case of diffusion. In this case, there is a barrier. In general, it refers to two compartments separated by a barrier, like the solutions inside and outside a cell; the cell membrane is the barrier. In this case, there are solutes in the solution that cannot move through the barrier. However, there is still a tendency for things to move to uniformity. So, in this case, water would move. It would move from the solution where there was less solute (and more water) to an area where there was more solute (and less water).

Answer 3

diffusion is the (passive) movement of particles moving from an area of high concentration to an area of low concentration.
an example of this is the diffusion of gases in leaves, this is vital for photosynthesis.
osmosis is just a special/specific case of diffusion.
it is the movement of water molecules across a partially permeable membrane from an area of high water concentration to an area of low water concentration.