topics 3.1-3.4 Flashcards
Members of an r-selected species characteristically
a. grow slowly
b. produce few offspring
c. reach sexual maturity quickly
d. have long life spans
e. are very protective of their offspring
c. reach sexual maturity quickly
Correct statements about the northern spotted owl include which of the following?
I. It is a pioneer species that is an opportunistic feeder.
II. It is dependent on mature, old-growth forest for its habitat.
III. It is a carnivore at or near the top of the food chain.
a. I only
b. II only
c. III only
d. I and II
e. II and III
e. II and III
The crude growth rate, r , of a population is calculated by
a. multiplying the existing population size by life expectancy
b. dividing the crude birth rate by 2
c. dividing the doubling time by 70
d. adding the crude birth rate to the crude death rate
e. subtracting the crude death rate from the crude birth rate
e. subtracting the crude death rate from the crude birth rate
Cycads are gymnosperms that were diverse and abundant during the Mesozoic era. Extant species of cycads share many traits with those from the Mesozoic era. Cycads bear cones, are long-lived with slow growth rates, show late reproductive maturity, and have very few offspring. Based on this description, the cycads are
a. K-strategists with a Type I survivorship curve.
b. r-strategists with a Type III survivorship curve.
c. K-strategists with a Type III survivorship curve.
d. r-strategists with a Type II survivorship curve.
a. K-strategists with a Type I survivorship curve.
A certain species of dinosaur laid large numbers of eggs, and the hatchlings had high mortality early in life. But if they survived, the young dinosaurs were able to grow at a rapid pace and disperse into the environment in order to thrive. Based on this information and the graph above, which of the following best characterizes this species of dinosaur?
a. The dinosaurs were r-strategists and exhibited a Type I survivorship curve.
b. The dinosaurs were r-strategists and exhibited a Type III survivorship curve
c. The dinosaurs were K-strategists and exhibited a Type II survivorship curve.
d. The dinosaurs were K-strategists and exhibited a Type I survivorship curve.
b. The dinosaurs were r-strategists and exhibited a Type III survivorship curve
The diagram above illustrates how the number of individuals in a population changed with time as a result of external stresses and resource limitations. Which lettered portion of the curve most likely corresponds to the carrying capacity of the ecosystem?
a. A
b. B
c. C
d. D
e. E
e. E
The K-selection reproductive strategy maximizes survival of offspring by producing
a. few offspring with high levels of parental care
b. few offspring with low levels of parental care
c. many offspring with high levels of parental care
d. many offspring with low levels of parental care
e. many offspring without parental care
a. few offspring with high levels of parental care
Which of the following is generally true of K-strategist species as compared to r-strategist species?
a. They reach sexual maturity earlier.
b. They have more young.
c. They are more likely to be invasive species.
d. They have longer life spans.
e. Their population cycles are more rapid.
d. They have longer life spans.
Based on the data in Figure 1, which of the following is the best estimate of the carrying capacity of the moose population?
a. 30
b. 50
c. 1,500
d. 2,500
c. 1,500
Which of the following claims is best supported by the data in the graph for the population of wolves between 1975 and 1985?
a. The population declined following depletion of food resources after a population overshoot.
b. The population reached its carrying capacity in 1980 because there was abundant prey.
c. The population increased exponentially when a new predator species was introduced to the island.
d. The population declined slightly and then returned to its carrying capacity following the outbreak of a disease.
a. The population declined following depletion of food resources after a population overshoot.
Which of the following best explains the change in the moose population from 1995 to 1997?
a. The large moose population led to a significant increase in the wolf population from 1995 to 1996, leading to increased predation of moose by wolves.
b. The high density of moose in the population led to a large number of moose emigrating from the island in search of mates and territory.
c. Plants in the area could not support the large population of moose in 1995.
d. The small number of wolves on the island could not support the large number of moose in 1995.
c. Plants in the area could not support the large population of moose in 1995.
Which of the following species is most likely to provide extensive parental care to its offspring?
a. species - oyster
# of fertilized eggs - 5,000,000,000
b. species - fish
# of fertilized eggs - 8,000
c. species - rabbit
# of fertilized eggs - 12
d. species - bobcat
# of fertilized eggs - 2
d. species - bobcat
# of fertilized eggs - 2
In the graph below charting the growth of a population of organisms, the line labeled K represents the…
a. biotic potential of the organism
b. doubling time of the population in the environment
c. carrying capacity of the population
d. reproductive lag time of the organism
e. intrinsic rate of increase of the population in the environment
c. carrying capacity of the population
Which of the following graphs best displays population size over time of an r-selected species that has just colonized a new habitat with abundant resources?
a.
b.
c.
d.
a.
Which graph best illustrates a population growing at its biotic potential?
a. A
b. B
c. C
d. D
e. E
b. B
