Zoology - Organisms and Populations Question with Solution | TestHub

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 acceleration phase until at zero growth rate the population stabilizes. This slowing of the rate of growth reflects increasing environmental resistance which becomes proportionately more important at higher population densities. Hence the statement, “both environmental resistance suddenly become effective and Mass mortality and population crash occurs” is not related to S-shaped population curve.