Populations and Ecosystems

A population of raccoons is living in a landfill. Scraps of food are brought in on the garbage trucks, so the raccoons thrive and reproduce, increasing the population in the landfill. Unfortunately, several raccoons pick up a contagious disease and transmit it to other raccoons. The population of raccoons soon drops as many die from the disease. After this, a tornado rips through the landfill and the rest of the racoon population is killed. The contagious disease is an example of a

• climax community
• density-dependent factor
• density-independent factor
• range of tolerance

A population of raccoons is living in a landfill. Scraps of food are brought in on the garbage trucks, so the raccoons thrive and reproduce, increasing the population in the landfill. Unfortunately, several raccoons pick up a contagious disease and transmit it to other raccoons. The population of raccoons soon drops as many die from the disease. After this, a tornado rips through the landfill and the rest of the racoon population is killed. The tornado is an example of a

• climax community
• density-dependent factor
• density-independent factor
• range of tolerance

In the two communities below, each shape represents one species. Which of the following is true about species richness and evenness?

• same species richness, but different species evenness
• different species richness, but the same species evenness
• different species richness and different species evenness
• same species richness and the same species evenness

The graph shows

• logistic growth
• linear growth
• a population without limiting factors
• exponential growth

Which letter represents the carrying capacity for this population?

• A
• B
• C
• D

Within a tree, you see 5 different species of birds. This collection of birds is called

• a biome
• a population
• a community
• an ecosystem

Which of the following is an example of climate?

• There is a cold front coming in this weekend
• A snowstorm is forecasted to hit the northeast US this week
• It is usually hot in Texas in July
• It rained 4 inches last week in Seattle, WA

Which of these is NOT an example of an abiotic factor?

• soil
• bacteria
• temperature
• rainfall

How much chemical energy is transferred from the producer level to the secondary consumer level in a food chain?

• .1%
• 1%
• 10%
• 100%

Organisms that eat both plants and meat

• omnivores
• herbivores
• autotrophs
• carnivores