The given graph is a representation of kinetics of a reaction. The y and x axes for zero and first order reactions, respectively are

zero order ( $\displaystyle y=$ rate and $\displaystyle x=$ concentration), first order ( $\displaystyle y=$ rate and $\displaystyle x=\mathrm{t}_{1 / 2}$ )

zero order $\displaystyle (y=$ concentration and $\displaystyle x=$ time), first order ( $\displaystyle y=\mathrm{t}_{\frac{1}{2}}$ and $\displaystyle x=$ concentration)

zero order $\displaystyle (y=$ concentration and $\displaystyle x=$ time), first order ( $\displaystyle y=$ rate constant and $\displaystyle x=$ concentration)

zero order ( $\displaystyle y=$ rate and $\displaystyle x=$ concentration), first order ( $\displaystyle y=\mathrm{t}_{\frac{1}{2}}$ and $\displaystyle x=$ concenration)