What are three basic population growth curves? When might you see them in nature?
What will be an ideal response?
The three types of population growth curves are the constant population growth rate, the J-curve (exponential growth) and the S-curve (logistic growth). The constant population growth rate remains constant over time and results in a straight line when plotted on a growth curve (population number vs. time). It is highly unlikely that this type of growth would be found in nature. The J-curve demonstrates population growth under optimal conditions, with no restraints. The S-curve shows a population at equilibrium. The J-curve is caused by exponential growth of a population and the absence of mechanisms to cause the population to level off; exponential growth can occur in nature. Humans, for example, have been growing exponentially for many generations now. J-curve growth is not sustainable and the consequence of this type of growth is a population crash and a reduction in the carrying capacity. The S-curve is caused by exponential growth of a population until natural mechanisms cause the population to level off at the carrying capacity (K) and continue in a dynamic equilibrium. The causes of this type of growth are the various biotic and abiotic factors that limit a population's size.
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One reason land masses affect the development of belts of atmospheric pressure is because ____
a. land masses are consistently warmer than the oceans year-round b. of the evaporation from lakes and streams c. land masses cause Coriolis deflection d. land masses are drier e. of the differential heating of land and water
Global belts of prevailing winds are caused by
A. the lower spin velocity and lower atmospheric solar heating at the equator. B. the higher spin velocity and higher atmospheric solar heating at the equator. C. the lower spin velocity and higher atmospheric solar heating at the equator. D. the higher spin velocity and lower atmospheric solar heating at the equator. E. None of these choices are correct.