$(a)$ What are the consequences of the following conditions?
$(i)$ $A$ cell having higher water concentration than the surrounding medium.
$(ii)$ $A$ cell having lower water concentration than the surrounding medium.
$(iii)$ $A$ cell having equal water concentration to its surrounding medium.
$(b)$ Name the materials of which the cell membrane and cell wall are composed.

(N/A) $(i)$ The cell will lose water by osmosis; therefore,the cell will shrink. This occurs in a hypertonic solution.
$(ii)$ The cell will gain water by osmosis; therefore,the cell will swell up. This occurs in a hypotonic solution.
$(iii)$ In the case of equal concentration,there will be no net movement of water; therefore,the cell will stay at the same size. This occurs in an isotonic solution.
$(b)$ The cell membrane is composed of lipids and proteins.
The cell wall is composed of cellulose.