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ch.21
| Question | Answer |
|---|---|
| Nene, the Hawaiian goose, live in the wild on Hawaii, Maui, Kauai, and Molokai. The population density on Maui is 0.227 birds per square kilometer, and the island is 1,830 square kilometers in size. Approximately how many nene live on Maui? | 415 |
| Which of the following has the highest population density? | 1,500 oysters living in an area of 1,500 square meters |
| A population will remain at a constant size when emigration equals immigration and | births equal deaths. |
| The size of a population can be decreased by | emigration. |
| Which density-dependent process contributed most significantly to the recovery of the North American monarch butterfly population after the severe winter losses of 2002? | Egg production is inversely proportional to density; the surviving monarchs had ample resources and experienced maximal reproduction. |
| A population of 100 individuals is undergoing exponential growth, with a constant growth rate of 0.2 per year. What size will this population be in 2 years? | 144 |
| Which of the following is likely to make the smallest contribution to annual changes in the size of a population? | global climate change |
| Which of the following choices best explains why some introduced species experience an initial period of exponential growth? | They typically have fewer natural predators and/or parasites in their new habitat, so their growth is unhindered until a critical resource becomes limiting. |
| The decrease in the availability of food, access to water, or access to cover that accompanies increasing population size illustrates the concept of a(n) | density-dependent factor. |
| The maximum population size that can be supported by its habitat is known as | carrying capacity. |
| The top of the “S” in an S-shaped curve indicates that the population | has reached its carrying capacity. |
| The carrying capacity of the above environment for paramecia is | 200 individuals per milliliter of medium. |
| When an isolated population reaches its carrying capacity | the birth rate = the death rate. |
| The carrying capacity of owls in an Alaskan forest is 8 per square kilometer. What will happen if 12 owls are confined to a 1-square-kilometer area? | The owls might survive as malnourished adults, but the next generation will have no more than eight individuals. |
| A giant puffball such as the one shown above will produce trillions of spores. With this many spores produced, what keeps the organic matter on Earth from being entirely consumed by these and other decomposing fungi? | The high reproductive effort is an indication of the low success rate for spores; most fail to land in viable habitats. |
| Density-dependent factors are more likely to limit population growth when | there are many individuals living in a fixed amount of space. |
| The effects of pollution are generally considered to be density independent because | the level at which any organism is contaminated with pollutants is unaffected by variations in population density. |
| What statement best describes the relationship? | At high planting densities, seed production per plant declines while total seeds produced remain constant. |
| Is it reasonable to expect that all habitats suitable for a given organism will have the same carrying capacity for that organism? | No; the habitat is the location where all essential resources occur, but these resources may be available in varying amounts. |
| For most populations, irregular fluctuations in size or density | are more common than the smooth J-shaped growth curve. |
| How might this increase in population growth be explained? | Prior human populations were at existing carrying capacities, but newly developed technologies have raised the carrying capacity and permitted the recent expansion. |
| The figure above suggests that humans | have been living at a level that exceeds the biosphere’s capacity for regeneration. |
| The amount of productive land and water that individuals or populations require to provide their required resources and dispose of its wastes is called the | ecological footprint |
| Billions of people throughout the world currently consume insects and this number will likely increase if population growth trends continue upward. Consuming insects makes good sense for all of the following reasons EXCEPT | onsuming insects helps reduces their overall impact as pest organisms. |
Created by:
veronica1738