Explain why, osmosis can be considered to be a specieal kind of diffusion.
(i) osmosis, and (ii) diffusion :
(a) swelling up of a raisin on keeping in water
(b) spreading of virus on sneezing
(c ) earthworm dying on coming in contact with common salt
(d) shrinking of grapes kept in thick sugar syrup
(e) preserving of pickles in salt
(f) spreading of smell of cake being baked in the kitchen
(g) aquatic animals using oxygen dissolved in water during respiration

Answer

In both, diffusion as well as osmosis, there is movement of particles from a region of higher concentration to a region of lower concentration. Diffusion can take place without there being a membrane or through a permeable membrane (which allows both solvent particles as well as solute particles to pass through it). Osmosis takes place only through a semi-permeable membrane (which allows only solvent particles to pass through it) (i) Osmosis : (a), (c ), (d) and (e) (ii) Diffusion : (b), (f) and (g)