Intro to Biology Questions

Topics: Demographic economics, Demography, Population growth Pages: 5 (1544 words) Published: February 17, 2011
1.If an endangered species such as the Santa River Woolly Star were to become extinct, what effects might this have on other species? The community of organisms will be greatly affected if the Santa River Woolly Star were to become extinct. The Woolly Star is an interwoven strand in a crossing of organisms that are all dependent upon one another for survival. The Woolly Star also stabilizes the sand after flooding which has a [positive effect on other organisms. 2.What do the J- and S- shaped population curves indicate about the life span of an organism? Organisms that live in a temporary habitat are examples of J shape growth curve. J shape growth curve indicates that the organisms outgrow the amount of resources available and death rates increase. S shaped growth curve organisms are affected by the more organisms in the population the more limiting the environment is to population growth. Population size in S shape double as it does in J shape however as more organisms appear they compete for limited resources in time the population stabilizes at a rate the environment can sustain. 3.Does competitive exclusion limit the diversity within a given community? Competitive exclusion will eventually limit diversity. As both species compete for a food surface one will typically dominate and the other would become extinct and therefore there would be limited diversity.

4.Why are field studies, such as the monitoring of owls, important in the study of ecology? The ecology is the study of the community which is a group of organisms including animals and vegetation that tend to occur together. Field studies that monitor owls review the relationship between the environment, predator and prey.

5.How does mutualism differ from commensalism?
Mutualism is an example of when both members/participants benefit from the partnership. In the example given in the video a commensalism relationship may be a hole in a tree and an owl living in it. The owl benefits the tree doesn’t benefit nor does it suffer. 6.What effect did the agricultural revolution have on the growth of the human population? The human population was able to grow at much more fast rate because it was not reliant upon the food source of the Earth instead man could control the food supply. 7.What does the demographic transition model say about birth and death rates? The demographic transition model is when death rates are lower than birth rates. The population as a result will grow very rapidly. 8.In your opinion, is a 0 population growth rate possible?

Although the video stated that Sweden has a zero population rate I believe it would be unable to sustain such a rate on a global scale. As we have learned populations are controlled in part to the environment and resources. If man is controlling its resources provided by the environment than we will not be able to sustain a zero population. 9.What critical factors could affect the age structure diagram? The age structure diagram is affected by the amount of children individuals are having. IN the case of a pyramid type structure in the age structure diagram we can expect an increase in population. 10.Do you believe that the human population n can stabilize without widespread starvation, war, or epidemics? I do not believe there will be stabilization without a global catastrophe. People appear not to be limiting the amount of children they are producing and there is no indication that a change will occur. Page 338, questions 1–8

1.Is the clapper rail headed for extinction or is the species having a temporary decline due to excessive predation, lack of resources, a disruption in the lower tropic levels, or some other reason? Explain your response as it relates to the specific ecosystem. The Clapper Rail is now endangered because seventy five percent of its habitat (The salt water marsh) has been lost due to development. The ecosystem that it resides within is self perpetuating through the flow of tides each...
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