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- Figure 45.10b If the major food source of the seals declines due to pollution or overfishing, which of the following would likely occur? The carrying capacity of seals would decrease, as would the seal population. The carrying capacity of seals would decrease, but the seal population would remain the same. The number of seal deaths would increase but the number of births would also increase, so the population size would remain the same. The carrying capacity of seals would remain the same, but the population of seals would decrease.Figure 19.6 If the major food source of seals declines due to pollution or overfishing, which of the following would likely occur? a. The carrying capacity of seals would decrease, as would the seal population. b. The carrying capacity of seals would decrease, but the seal population would remain the same. c. The number of seal deaths would increase, but the number of births would also increase, so the population size would remain the same. d. The carrying capacity of seals would remain the same, but the population of seals would decrease.Suppose 200 fish are marked and released in a pond. The following week, 200 fish are caught and 100 of them have marks. There are about ______ fish in this pond. a. 200 b. 300 c. 400 d. 2,000
- Analyzing ecological footprints reveals that(A) Earth’s carrying capacity would increase if per capita meatconsumption increased.(B) current demand by industrialized countries for resourcesis much smaller than the ecological footprint of thosecountries.(C) it is not possible for technological improvements toincrease Earth’s carrying capacity for humans.(D) the ecological footprint of the United States is large becauseper capita resource use is high.As an ecologist who manages a wildlife preserve, you want to increasethe preserve’s carrying capacity for a particular endangered species.How might you go about accomplishing this?SCIENCE, TECHNOLOGY, AND SOCIETY Some people regardthe rapid population growth of less industrialized countries asour most serious environmental problem. Others think that thepopulation growth in industrialized countries, though smaller,is actually a greater environmental threat. What problems resultfrom population growth in (a) less industrialized countriesand (b) industrialized nations? Which do you think is a greaterthreat, and why?
- Explain why you agree or disagree with the followingpropositions:a. Stabilizing population is not desirable because, without more consumers, economic growth would stop.b. The world will never run out of resources becausewe can use technology to find substitutes and tohelp us reduce resource waste.c. We can shrink our ecological footprints while creating beneficial environmental impacts.Why is the change in human footprint relatively low for the most agriculturally suitable land? a) Very little of the land is highly suitable for agriculture b) Cities put little pressure on the environment, and tend to be in very agriculturally suitable areas c) Pressure was already high thereWhich of the following is a consequence of biologicalmagnification?(A) Toxic chemicals in the environment pose greater risk totop-level predators than to primary consumers.(B) Populations of top-level predators are generally smallerthan populations of primary consumers.(C) The biomass of producers in an ecosystem is generallyhigher than the biomass of primary consumers.(D) Only a small portion of the energy captured by producersis transferred to consumers.
- Which of the following is true of overexploitation? Select ALL that apply. a Only animals are affected by overexploitation. b Overfishing is due to modern fishing techniques that can take a lot of fish at once. c Amphibians are overexploited for food, medicine, and research. d Overexploitation means harvesting species at a rate slower than the population can recover. e Many birds are overcollected for the pet trade.A population of deer suddenly decreases dramatically in number. This most likely occurred because ____. a. the was a gradual decrease in environmental resistance b. the population approached its carrying capacity c. population crashes are common and expected on a regular basis regardless of population size d. the number of resources increased steadily e. the population increased beyond its carrying capacityYou study a population of mussels recently introduced to a section of the Rideau River 9 years ago. You know that 20 mussels were originally let go in the river by a resident. These mussels have no predators. You know from your research that, under ideal conditions, the instantaneous rate of increase of this mussel species is 0.17. You also think the conditions on the river were ideal when the mussels were introduced. After surveying the food available in the river, you estimated that there is enough food to support a population of 12,700 mussels. How many mussels do expect to be in the river now?