APES Test, Chapter 6 & 7
Terms in this set (30)
The crude birth rate of a population is expressed as a...
During a single Oregon winter, minimum temperatures did not get much below freezing. The following summer large mosquito populations were observed in ponds. Cold weather came early the next winter and most ponds froze for 3 months. This following summer, very low mosquito populations were observed. What bet explains this pattern in the mosquito population?
a density-independent factor
When an insect eats the lettuce seedling in your yard, it is engaging in...
A laboratory experiment followed the growth of a flour beetle population over time. At first the population increased dramatically but later growth slowed and the population size leveled off. While food was abundant, the flour beetles began to eat their own eggs when densities got high. What might we hypothesize about this behavior in the flour beetles?
it serves as a density-dependent means of population control
_______ succession begins on bare rock after glaciers have passed, or on newly formed volcanic islands/
All of the populations organisms within a given area make up a/an
Population size can be estimated using the formula
CBR + Immigration - CDR - Emigration
Using the rule of 70, a population growing at 10 percent would double in
What is one reason for an even distribution pattern among a particular species in a community?
the species is territorial
Which of the following is NOT true of the general pattern of succession, from a recently distributed terrestrial site to stable, self-sustaining forest community?
total biomass tends to decreases
If the growth rate of a population is positive and remains constant, the number of people added to the population
increases every year
An exotic species is one which ________ an ecosystem
is foreign to
A species that plays a major role in determining the structure of its ecological community is...
a keystone species
Malthus believed that human populations grow ______ while food supply grows ________.
Populations with an age structure diagram that is narrower at the bottom than at the top have...
a declining population
The roots of many plants are infected with a specialized fungus. The plant supplies carbon to the fungus, and the fungus supplies nutrients to the plant. How can this relationship be classified?
A brightly colored insect that is poisonous to predator is using
morphological and chemical defenses
At present, Earth's human population is...
Which does NOT describe patterns of population growth
population size is not affected by other populations
An age structure diagram in which the youngest people are the smallest percentage of the population probably represents a country with...
a population that will begin to shrink when that age group reaches sexual maturity
Which is NOT a type of interspecific interaction.
Which factor is NOT typically density-dependent in an animal population
A biologist who studies interactions at the community level investigates interactions between...
populations of more than one species
The human population is currently following roughly a J-shaped curve. This means that the population is...
The total fertility rate is an estimate of...
the average number of children each woman in a population will bear
The intrinsic growth rate of a population...
is the maximum potential for growth in a population under ideal conditions
The first plant community that forms on bare rock often includes organisms such as...
lichens and mosses
A country has a total fertility rate equal to replacement level fertility and emigration equal to immigration. Which of the following must be true?
the population is stable
Which does NOT cause rapid population in a population?
introduction of a new parasite
Two species of buttercup can be found in the same field in South Dakota. One species flowers in early spring, and the other species flower in late summer. Both are pollinated by the same insect species. The different flowering times are an example of _________.