SC260 LESSON 3 ANSWERS - ASHWORTH
SC260 Lesson 3 Answers (Ashworth)
Question 1
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5 / 5 points
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If, via global warming, the temperatures increased in Canada, the red maple might be able to extend its ________ to the North.
Question options:
population size
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migration route
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age structure
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geographic range
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Question 2
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5 / 5 points
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In long-lived species of organisms, the primary advantage of delaying reproduction (late maturity) is:
Question options:
<p>increased survivorship.</p>
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<p>obtaining a higher quality territory.</p>
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<p>increased number of mates.</p>
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<p>larger initial body size during the first reproduction event.</p>
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Question 3
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0 / 5 points
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Heightened male-to-male aggression around female mates is likely the result of:
Question options:
intersexual selection.
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intrasexual selection.
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polygamy.
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delayed sexual maturity.
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Question 4
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5 / 5 points
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The K in the term K-strategist refers to:
Question options:
<p>intrinsic rate of growth.</p>
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<p>kill rate.</p>
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<p>fecundity.</p>
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<p>carrying capacity.</p>
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Question 5
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5 / 5 points
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Reproductive success of an organism is best measured by its:
Question options:
fitness.
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ability to attract a mate.
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number of offspring that survive to reproduce.
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life span.
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Question 6
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5 / 5 points
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Self-thinning:
Question options:
is found only in populations of mobile organisms.
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occurs at high population densities.
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functions to increase the survival rate of all individuals in the population.
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is a type of scramble competition.
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Question 7
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5 / 5 points
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When individuals in a small population have difficulty finding a mate, this is referred to as:
Question options:
density dependence.
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promiscuity.
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the Allee effect.
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self thinning.
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Question 8
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5 / 5 points
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A flood wiping out a population would be an example of:
Question options:
exponential growth.
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survivorship curve.
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demographic stochasticity.
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environmental stochasticity.
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Question 9
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5 / 5 points
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Which of the following sampling techniques represents an index of abundance rather than an estimate of density?
Question options:
Number of oak trees within a quadrat
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Number of bear droppings along a trail
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Ratio of marked and unmarked mice in a field
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Number of ducks on a pond
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Question 10
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5 / 5 points
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A systematic compilation of mortality and survival data for a population is called a(n.:
Question options:
age pyramid.
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life table.
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cohort group.
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probability summary.
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Question 11
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5 / 5 points
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A population reaches a stable-age distribution when the:
Question options:
<p>population stops growing.</p>
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<p>birthrate is less than the death rate.</p>
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<p>net reproductive rate (R<sub>0</sub>) is zero.</p>
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<p>proportion of individuals in each age group remains the same.</p>
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Question 12
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5 / 5 points
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Parental care is best developed among:
Question options:
ants and bees.
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fish.
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salamanders.
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snakes and turtles.
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Question 13
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5 / 5 points
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Which of the following represents a modular organism?
Question options:
Lizard
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Coral
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Dog
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Ant
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Question 14
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5 / 5 points
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Early sexual maturity is predicted to result in:
Question options:
lower overall lifetime reproduction.
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higher overall lifetime reproduction.
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higher reproduction earlier in life.
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higher reproduction later in life.
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Question 15
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5 / 5 points
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The sex ratio of human senior citizens (>65 years) is:
Question options:
skewed toward females.
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skewed toward males.
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1:1.
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the same as birds'.
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Question 16
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5 / 5 points
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Which of the following best represents a measure of ecological density?
Question options:
Number of frogs per meter of pond shoreline
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Number of birds per hectare
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Number of mammals per meter
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Number of fish per volume of ocean
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Question 17
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5 / 5 points
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A population reaches a stable-age distribution when the:
Question options:
<p>population stops growing.</p>
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<p>birthrate is less than the death rate.</p>
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<p>net reproductive rate (R0) is zero.</p>
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<p>proportion of individuals in each age group remains the same.</p>
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Question 18
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5 / 5 points
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Successful reproduction can result in a:
Question options:
lower chance of future mortality.
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higher chance of future reproduction.
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lower chance of future reproduction.
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lower probability of flowering.
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Question 19
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5 / 5 points
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Which of the following species' range has extended extensively over the past 100 years?
Question options:
Grizzly bear
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Gypsy moth
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Polar bear
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Spotted owl
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Question 20
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5 / 5 points
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When extreme contest competition occurs within a population:
Question options:
all individuals receive insufficient resources for survival and reproduction.
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local extinction may occur.
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only a portion of the population suffers.
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the growth rate of the population increases.
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