Provide a quantitative comparison of growth rates.

(N/A) The diagram shows a comparison of absolute and relative growth rates. Both leaves $A$ and $B$ have increased their area by $5 \ cm^{2}$ in a given time to produce leaves $A^{1}$ and $B^{1}$.
- The quantitative comparison between the growth of living systems is done in the following two ways:
$(1)$ Absolute Growth Rate: It is the measurement and comparison of total growth per unit time.
$(2)$ Relative Growth Rate: It is the growth of the given system per unit time expressed on a common basis,e.g.,per unit initial parameter.
- Leaves $A$ and $B$ shown in the figure have grown $5 \ cm^{2}$ in one day.
Although their initial sizes are different,i.e.,$5 \ cm^{2}$ and $50 \ cm^{2}$ respectively,both show an absolute increase in area in the given time to produce leaves $A^{1}$ and $B^{1}$,which is $5 \ cm^{2}$ in both cases.
Out of these two,the relative growth rate is higher in leaf $A^{1}$ because the initial area of leaf $A$ is smaller compared to leaf $B$.