Homework 8

Complete the following and submit the Word document by midnight Sunday. Remember to include complete citations for all sources used to answer each question.Are most invasive (exotic) species K-selected or r-selected species? Explain your choice and why that makes sense in terms of their ecological success.Briefly define a community and an ecosystem and describe how the two are interrelated.Which of the following levels of organization are in order, from simplest to most complex.a.  population, organism, community, ecosystemb.  community, ecosystem, population, organismc.  organism, community, population, ecosystemd.  population, ecosystem, organism, communitye.  organism, population, community, ecosystemMosses growing on bare rock will eventually help to create soil.  These mosses are involved in ___ succession.a.  primaryb.  secondaryc.  tertiaryIf a farmer sprays a pesticide onto a field and kills half of the insect pests, he has caused a reduction in________.a.  field capacityb. carrying capacityc. population sized. More than one of the aboveWhat type of survivorship curve would you expect for a plant species in which only a few seeds are produced and most of these survive to produce adult plants?a.  type Ib.  type IIc.  type IIIAn ecological niche is an organism’s_______ in an ecosystem.a. locationb.  habitatc.  resourcesd.  functionNo matter how rapidly populations grow, they eventually reach a limit and begin to stabilize. This is called the ______________.Unicellular algae live in the tissues of coral animals.  The algae provide food for the coral, while the coral provides a stable home for the algae. This is an example ofa.  Parasitismb.  Commensalismc.  MutualismThe vast majority of energy taken into an ecosystem is____________.a.  converted into biomass by plants.b.  utilized by secondary consumers.c.  lost as heat.d.  used by the primary consumers.e.  concentrated in the decomposers.A farmer is using an insecticide to treat his crops. While most insects do not survive their first exposure to the insecticide some have a gene that enables them to survive. When these survivors reproduce they will likely pass along this resistance to their offspring. This results in an increase in numbers of the insects over time. Which of the following processes applies to this survival?a. cloningb. mutationc. natural selectiond. genetic engineeringWhat is the ecological relationship between insects and crops?a. mutualismb. competitionc. predationSea anemones growing on the backs of crabs without damaging the crabs are an example ofa.  Parasitismb.  Commensalismc.  MutualismWhich of these is a population density-independent regulating factor?a.  Competitionb.  Predationc.  Size of populationd.  Weathere.  Resource availabilityProducers are_________.a.  Autotrophsb.  Herbivoresc.  Omnivoresd.  CarnivoresIf biological magnification occurs, the ___ will have the highest levels of toxins in their systems.a.  producersb.  herbivoresc.  primary carnivoresd.  top carnivoresGiven the amount of sunlight that hits the plants on our planet, and the ability of plants for rapid growth and reproduction, how come we aren’t all hip deep in dead plants?

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