Ecology & Ecosystems Quiz 2

Is the following factor density-dependent or density-independent? PREY

• Density Dependent

• Density Independent

Is the following factor density-dependent or density-independent? Disease

• Density Dependent

• Density Independent

Is the following factor density-dependent or density-independent? FOOD

• Density Dependent

• Density Independent

Is the following factor density-dependent or density-independent? Volcanic Eruption

• Density Dependent

• Density Independent

The _________________ _____________________ describes the total number of animals a given area of land can sustain.

• Population Density

• Community Growth

• Carrying Capacity

As a population approaches carrying capacity (K), which of the following is predicted by the logistic growth equation?

• the growth rate will be zero

• population will increase exponentially

• carrying capacity will increase

A lucky yeast cell falls into your glass of grape juice and reproduces for 10 hours. What type of growth curve is being demonstrated? (Yeast really, really like the juice-plenty of food)

• Exponential growth curve

• Logistical growth curve

Woodpeckers peck trees to find food and make nests. What would happen if most of the trees are cut down?

• The woodpecker populations will lack adequate resources and will decrease.

• The woodpecker populations will raise more young per year.

• The woodpecker populations will experience greater immigration.

• The woodpecker populations will use new food sources and nesting sites.

The carrying capacity for adult frogs in a wetlands ecosystem is 1000 individuals. The frogs eat flies and other small animals, and they are prey for raccoons, snakes, and large birds. Which event will most likely happen if an additional 200 adult frogs immigrated to the ecosystem?

• The frog population would experience a pattern of exponential growth.

• The carrying capacity for frogs would increase by 200 frogs.

• About 200 adult frogs would die because of lack of resources, or by predation.

A food web shows feeding relationships in an ecosystem. In this food web, what is represented by the chains of arrows from the grass to the fox?

• the one-way flow of energy through the ecosystem

• the conservation of energy in the ecosystem

• the removal of energy from the ecosystem