From an ecologist’s point of view, population structure does not include the
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Solution
Population structure includes numbers, spacing and age distribution of genotypes. Biomass is often the best measure of density for some organisms like plants.
Which of the following would probably not be true of a population whose dynamics are primarily influenced by density – independent factors?
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Solution
The logistic growth curve describes density-dependent growth because the rate of increase in the size the population steadily decreases as the carrying capacity is approached. The nutritional status of the females of the population would depend on the availability of food and hence would be density-dependent. Un-favourable weather, on the other hand, generally occurs without any predictable relationship to the size of a population and thus is a density-independent factor.
If the number of deaths in a population equals the number of births, it is
Choose the collection of terms that completes the following sentence :
Plants are ____ organisms, they frequently show a ______ spatial distribution, and their population density is most appropriately expressed in terms of ______ .
At carrying capacity, a population____.
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Solution
Ecologists define carrying capacity as the maximum population size that a particular environment can support with no net increase or decrease over a relatively long period of time. Many populations oscillate about their carrying capacity or overshoot it at least once before attaining a relatively stable size.
In the formula G = rN (K – N)/K, the factor rN tends to cause the population to _____.
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Solution
The difference between birth rate and death rate is symbolized as r. N is the population size. So rN is the population growth rate.
Explosive growth in human population size can be attributed largely to . .
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Solution
Human death rates have decreased due to declining infant mortality that has resulted from improved nutrition, medical advances, and better sanitation.
Human population growth ________
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Solution
The exponential growth model virtually describes the population explosion of humans.
When birth rate equals death rate,
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Solution
When birth rate is equal to death rate individuals are being added to the population at the same rate at which they are being removed from the population(note that this fails to consider migration).
An ecologist would suspect that a population is growing rapidly if it
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Solution
This would indicate that a larger number of individuals will be entering their reproductive years than are currently reproducing.