Question

A biologist studied the population of rats in a granary. He found the average natality was 280, average mortality was 200, immigration was 40 and emigration was 50. The net increase in population is:

(i) Write an equation for Verhulst-Pearl Logistic Growth Curve where: N = Population density at time 't' r = Intrinsic rate of natural increase (ii) Draw a graph for a population whose population density has reached carrying capacity. (iii) Draw a growth curve where resources are non-limiting to growth of population. (iv) Which growth curve is considered more realistic and why? Explain.