(i) A—Exponential growth curve 5—Logistic growth curve
(ii) Logistic growth curve B is considered more realistic one because the resources are finite and become limited sooner or later.
(iii) K stands for carrying capacity which refers to the maximum number of individuals of a population that the given environment can sustain at a given time.
(iv) N symbolises population density, i.e. the number of individuals of a species in a given population per unit area.