(b)Exponential
growth curve is also called J-shaped curve or geometric growth curve.Logistic
curve is also called sigmoid growth curve J-shaped curve.Exponential
Growth Model When
the resources availability is unlimited in the habitat, the population grows
in an exponential or geometric fashion. As resources are unlimited than there
is no inhibition from crowding.The
equation is; Birth rate, Death rate Population density, = Rate of change of populationLet
(b-d) = r, then the equation is, ![](13.ORGANISMS%20AND%20POPULATIONS_files/image127.png) Intrinsic rate of natural increaseWhen
a population shows exponential growth, the curve plotted with in relation to time, assume J shapeIn
this there is no fix carrying capacity Logistic
Growth Model No
population can continue to grow exponentially, as the resource availability
become limiting at certain point of time. Logistic growth model have fixed
carrying capacityIt
is described by the equation Rate of change of population
densityN
= Population
density at timeN
= Population
densityr
= Intrinsic rate of
natural increaseK
= Carrying capacity Population
growth curve when resources are not limiting.
Plot is exponential or geometrical curve . When resources are limiting the
growth, plot is logistic is carrying capacity |