MCU2 Quiz

Which of these is an example of a biotic factor that could affect the size of a population?

• Climate

• Disease

• A natural disaster

• Water availability

What is an example of an abiotic factor in an aquatic system?

• Water lilies float on top of pond.

• A population of bass is living in a lake.

• The pH of a lake is decreased by acid rain.

• Dragonflies feed on small insects near a pond.

The picture shows a food web in the forest. Which of these is represented by the diagram?

• Abiotic factors

• Community

• Ecosystem

• Population

Which of these is an example of a population in a desert ecosystem?

• A saguaro cactus

• the amount of rainfall

• a fennec fox and its young

• hawks and the lizards they feed on

Which of these events would lead to an increase in the size of a population of squirrels?

• More squirrels are born than die.

• Some squirrels emigrate in search of food.

• New predators are added to the ecosystem.

• A large number of schools die because of a forest fire.

Which of these is the most likely reason that a population in an ecosystem could have sharp decline?

• The number of prey suddenly increases.

• The number of predators suddenly decreases.

• The competition for the same resource suddenly drops.

• The abiotic resources in the environment suddenly drops.

This graph shows the population of a group of rabbits in a restricted area studied over a period of 5 years. Which statement might explain why the population leveled off on the graph?

• The resources in the area ran out.

• The rabbits encountered a new disease.

• Predators were introduced into the area.

• Competition for resources limited the rabbit population.

Which statement describes a difference between predators and prey?

• Prey are types of plants, whereas predators are types of animals.

• Prey remain in one place but predators move around with the ecosystem.

• Prey get energy only from plant materials and predators only eat animals.

• Prey are hunted for food and predators capture and eat other animals to get energy.

Which organism would be least affected by overfishing for cod in Arctic waters?

• seals

• shrimp

• baleen whales

• toothed whales

Grizzly bears' diet consists of roots, tubers, berries, nuts, fungi, insects, rodents, and fish. Which ecological role best describes grizzly bears?

• producers

• carnivores

• omnivores

• herbivores