Exam 27: Population Growth and Regulation

The United Nations estimates that by 2050, the world's population may reach over billion and still be growing.

What factors determine Earth's carrying capacity for humans?

If a population of 100 birds increases to 120 birds in a year, what is the value of r?

In the equation, population growth = r × N, the letter r stands for .

Density- dependent factors become more effective at limiting population growth as the size of the population .

When predators and prey both have population cycles, the predator cycle tends to that of the prey cycle.

-Which population represented on the graph has the highest biotic potential?

Zebra mussels were introduced into Lake St. Clair around 1988. The table lists the population densities (in grams dry weight per square meter of lake bottom) of native unionid mussels and exotic zebra mussels in the lake before and after this introduction. Both groups feed by filtering small particles from the water. Based on the information given, which of the following best describes the likely relationship between zebra mussels and unionids?

Exponential growth occurs

All members of a species that reside within an ecosystem make up a(n)

The is made up of the entire Earth and all of the living organisms that inhabit it.

In countries where the number of children younger than 15 is approximately equal to the number between ages 15 and 45, the population is

Logistic population growth is characteristic of a population that moves into a new habitat, experiences a rapid increase in number, and then stabilizes.

How does environmental resistance affect a population?

The sum of all factors (living and nonliving) that limit the ability of a population to grow is known as .

What is the term for regular population cycles of rapid growth followed by massive die- off?

An ecologist is studying the painted turtle population in a small pond. At the beginning of the year, there are 100 individuals. Over the course of a year, 40 turtles are born and 60 die. There is no migration. What is the growth rate (r) of the painted turtle population?

Within their territory, pack animals such as wolves exhibit a uniform distribution.

A population of rabbits introduced into an island grew rapidly for a few years and then the growth slowed down and stabilized. Why did the population become stable?

Invasive species can rapidly disrupt an ecosystem because they have a high biotic potential and face little environmental resistance.