equation correctly describes sigmoid growth curve
Answers
Answer:
The stages of the sigmoidal population growth curve can be summarised as follows:
Exponential Growth Phase: N + I >>> M + E (much greater than)
Transitional Phase: N + I > M + E (greater than)
Plateau Phase: N + I = M + E (equal)
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Skill:
• Modelling the growth curve using a simple organism such as yeast or a species of Lemna
Population growth curves can be modelled using simple organisms such as yeast or duckweed (Lemna)
These organisms can be grown on agar plates (yeast) or in cups of water (duckweed)
There are many benefits to using simple organisms like yeast and duckweed to model population growth:
These organisms are small and so can easily populate small containers that are easy to store
Nutritional requirements are low, making experiments inexpensive to conduct
These organisms reproduce very rapidly, allowing results to be generated in a relatively short period of time
Yeast and Duckweed
yeast duckweed
When grown in controlled conditions, these simple organisms will demonstrate the phases of a sigmoidal growth curve:
After an initial lag period, there will be a period of exponential growth whilst resources remain abundant
As resources become limited, the growth rate may begin to slow before eventually becoming stationary (plateau)
Because organisms are being grown in closed systems, an accumulation of metabolic waste will inevitably occur
This will eventually lead to an increase in the rate of death and an overall reduction in population size
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