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Describe briefly:

a)Arithematic growth

b)Geometric growth

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. 

 

s shaped population growth form

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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..........

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Yes they both are correct..........
HOPE IT HAD HELPED YOU...........
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a) Arithmetic growth refers to the situation where a population increases by a constant number of persons (or other objects) in each period being analysed.
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b) Exponential growth is exhibited when the rate of change?the change per instant or unit of time?of the value of a mathematical function is proportional to the function's current value, resulting in its value at any time being an exponential function of time, i.e., a function in which the time value is the exponent.
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c) S-shaped growth curve (sigmoid growth curve) A pattern of growth in which, in a new environment, the population density of an organism increases slowly initially, in a positive acceleration phase; then increases rapidly approaching an exponential growth rate as in the J-shaped curve; but then declines in a negative .
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