Biology Study Guide 4

Refer to the illustration above. During which time period are the birth and death rate equal?

• period "A"

• period "B"

• period "C"

• period "D"

Refer to the illustration above. The rate of growth of a population is represented by r. The time period during which r would have a negative value is

• period "A"

• period "B"

• period "C"

• period "D"

The movement into a population is known as:

• emigration

• immigration

• dispersion

• life expectancy

The graph above shows the birth rate and death rate for a population during the 1900s. From 1900 to 2000, the population has:

• increased

• decreased

• stayed the same

• increased until 1930, then decreased

The graph demonstrates changes in the populations of lynx and snowshoe hares. Which statement BEST describes what the graph shows about the populations of lynx and snowshoe hares?

• Both populations vary randomly and independently.

• Both populations increase and decrease at the same time.

• A change in the hare population follows a similar change in the lynx population.

• A change in the hare population precedes a similar change in the lynx population.

Rabbits introduced into Australia over 100 years ago have become a serious pest to farmers. Rabbit populations increased so much that they displaced many native species of plant eaters. What is the most logical explanation for their increased numbers?

• Rabbits have a high death rate.

• There are few effective predators.

• Additional rabbit species have been introduced.

• There is an increase in rabbit competitors.

The news often talks about how global warming could change environmental conditions on Earth. Which BEST explains why global warming is such a concern?

• Glaciers will advance.

• The sea levels will rise.

• Earthquake activity will increase.

• The overall temperature will decrease.

In 1598, explorers discovered the dodo bird on an island in the Indian Ocean. The bird was overhunted, and it became extinct by 1681. Soon after the dodo became extinct, the calvaria tree, found on the same island, stopped reproducing. Which statement describes the relationship that MOST likely existed between the dodo and the calvaria tree?

• Dodos built their nests in the calvaria tree.

• The roots of the calvaria tree were eaten by the dodo birds.

• The eggs of the dodo would hatch under the shade of the calvaria tree.

• Dodos helped in the process of sprouting calvaria seeds.

The zebra mussel is a freshwater organism from Europe. However, some were accidentally brought into the Great Lakes by shipping vessels. Which statement best explains how these mussels could threaten the ecosystems in the Great Lakes?

• They will provide a new food source to other animals in the Great Lakes.

• They can encourage other animals in the Great Lakes to evolve more quickly.

• They have no natural predators to limit their population, so they might outcompete native animals.

• They can actually stabilize the ecosystem by increasing the resources available

In a forest ecosystem, spotted owls make their homes in the cavities of dead trees. This same habitat is home to the mice that the owls feed on. Human activities, such as logging, have caused the population of the spotted owl to decline. From this information, what statement BEST explains the relationship between humans and the spotted owl?

• Humans have eliminated predators of the owls so there are more owls.

• Humans have moved the owls to zoos, so there are fewer owls in the woods.

• Humans have taken away resources needed by the owls, so there are fewer owls.

• Humans have increased the available food source for the owls, so there are more owls.