The given graph is a representation of kinetics of a reaction.
The y and x axes for zero and first-order reactions, respectively are
1
zero order (y = rate and x = concentration), first order (y = rate and x = t½)
2
zero order (y = concentration and x = time), first order (y = t½ and x = concentration)
3
zero order (y = rate and x = concentration), first order (y = t½ and x = concentration)
4
More than one of the above
5
None of the above