Population ecologists follow the fate of same-age cohorts to
determine if a population is regulated by density-dependent processes.
determine if a population's growth is cyclic.
determine the factors that regulate the size of a population.
determine the birth rate and death rate of each group in a population.
determine a population's carrying capacity.
According to Hamilton's rule,
natural selection is more likely to favor altruistic behavior that benefits an offspring than altruistic behavior that benefits a sibling.
natural selection favors altruistic acts when the resulting benefit to the beneficiary, corrected for relatedness, exceeds the cost to the altruist.
natural selection does not favor altruistic behavior that causes the death of the altruist.
altruism is always reciprocal.
the effects of kin selection are larger than the effects of direct natural selection on individuals.
bnatural selection favors altruistic acts when the resulting benefit to the beneficiary, corrected for relatedness, exceeds the cost to the altruist.
dolfactory receptor-electromagnetic receptor
edetermine the birth rate and death rate of each group in a population.
5 Multiple Choice Questions
A population with a positive value of r will grow exponentially.
tropical rain forest
Coastal snakes can detect odor molecules produced by banana slugs.
Coastal snakes have a genetically acquired taste for banana slugs.
regulating the pH of freshwater biomes and terrestrial groundwater.
Decomposition rate would decrease and NEP would increase.
5 True/False Questions
Sensory pathways have four basic functions: sensory reception, transduction, transmission, and perception. How do these functions differ between yourself and a star-nosed mole?
Select all that apply.
Select all that apply.
The perception of sensory input by humans and star-nosed moles differs.
The mechanism by which the energy of a sensory stimulus is transduced into a receptor potential differs between humans and star-nosed moles.
The number and type of sensory receptors in humans and star-nosed moles differ. → The perception of sensory input by humans and star-nosed moles differs.
The number and type of sensory receptors in humans and star-nosed moles differ.
Which of the following would be considered an example of bioremediation?
reconfiguring the channel of a river
using a bulldozer to regrade a strip mine
adding seeds of a chromium-accumulating plant to soil contaminated by chromium
dredging a river bottom to remove contaminated sediments
adding nitrogen-fixing microorganisms to a degraded ecosystem to increase nitrogen availability → vegetation demonstrating vertical layering
Which of the following could qualify as a top-down control on a grassland community?
limitation of plant biomass by rainfall amount
effect of humidity on plant growth rates
effect of grazing intensity by bison on plant species diversity
influence of temperature on competition among plants
influence of soil nutrients on the abundance of grasses versus wildflowers → effect of grazing intensity by bison on plant species diversity
The feeding relationships among the species in a community determine the community's
quickly reaches its carrying capacity.
cycles through time.
grows at its maximum per capita rate.
loses some individuals to emigration.
grows by thousands of individuals. → grows at its maximum per capita rate.