c)Sigmoid growth curve
Arithmetic growth refers to the situation where a population increases by a constant number of persons (or other objects) in each period being analysed.
Geometric growth refers to the situation where successive changes in a population differ by a constant ratio (as distinct from a constant amount for arithmetic change).
The sigmoid curve is a 'growth average' representing all organisms, where young organisms experience rapid accelerating growth to cope with their environment, followed by a continuous steady growth. Towards maturity, an organisms growth rate slows down until no growth occurs.
a) arithmetic growth:- in this typ of growth cells divides and forms daughter cells and these daughter cells matures and do not show division, the single cell which was producing these daughter cells will contineously divide.
b) geometric growth:- in this typ of growth cels will divide to form daughter cells and these daughter cells will again divide themselves, and this process will go on. the growth is geometrical e.g.2-4, 4-8, 8-16,.............
c) sigmoid growth curve:- if the geometrical growth is plotted against time, it shows a sigmoid growth curve. Initialy the growth will be slow, it is calles lag phage. When the growth is very fast it is called exponential phase (log phase). Due to limitted nutrient supply the growth will be under control and this phase is called stationary phase.
sorry i couldnt upload d graph..........