3.3-3.5 Quiz

The graph shows the population sizes for the moose population and the wolf population on Isle Royale. Based on the data in the graph, which of the following is the best estimate of the carrying capacity of the moose population?

1500

Dandelions grow quickly and produce many seeds, ensuring that at least some plants will survive and produce seeds themselves. What curve best represents the survivorship of dandelions?

A Type III survivorship curve has low survivorship early in life with few individuals reaching adulthood. Species with a Type III curve include r-selected species such as dandelions.

Population growing exponentially is represented by what in a graph?

A j-shaped curve.

Certain lizards display a survivorship curve where the chance of survival is independent of age. What line on the graph best depicts the survivorship of these lizards?

A type II survivorship curve shows a roughly constant mortality rate for the species through its entire life. This means that the individual's chance of dying is independent of their age.

This represents the biotic potential of the species in a graph.

Exponential population growth curve

What environmental conditions will have a negative effect on the limit a certain population of organisms is able to achieve in a habitat?

High levels of predation.

Which curve best represents a K-selected species?

K-selected species usually have a Type I survivorship curve. This relatively flat curve reflects low juvenile mortality, with most individuals living to old age.

What best explains the change in the moose population from 1995 to 1997?

Plants in the area could not support the large population of moose in 1995.

The diagram illustrates how the number of individuals in a population changed with time as a result of external stresses and resource limitations. What portion of the curve most likely corresponds to the carrying capacity of the ecosystem?

Point E. Stable on carrying capacity.

How can population growth rates be read from a graph?

Population growth rates can be shown from the structure of the graph. A rapidly growing population will have a higher proportion of younger people compared to stable or declining populations.

Which species was first to reach the carrying capacity of the ecosystem for that particular kind of organism?

Species 4.

In a graph, this represents the maximum number of individuals that can be supported by a particular ecosystem on a long term basis.

The carrying capacity.

Cycads are gymnosperms that were diverse and abundant during the Mesozoic era. Ext ant 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 what type of species?

The cycads are K-strategists with a Type I survivorship curve.

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 what best characterizes this species of dinosaur?

The dinosaurs were r -strategists and exhibited a Type III survivorship curve.

What is the carrying capacity of the ecosystem?

The maximum # of individuals that can be supported by a particular ecosystem on a long term basis.

The graph provided shows the population of an organism introduced to a new environment and how the population changed over sixty days. After the sharp rise, there was a leveling off of the population. What does this indicate?

This environment has only enough resources to support 250-300 individuals of this organism.

In a graph, this represents the growth of a population predicted by the logistic model.

Type of population growth curve.

What factors can change the shape of an age structure diagram so it represents a decreasing population density?

When there are more resources such as food and medicine, the diagram can show more rapidly growing population. When there are more resources, such as birth control and education, the more the diagram can reflect a more stable population.

Population density

A measurement of the number of people per given unit of land