Review for MP3 Quarterly

Abiotic factors are nonliving things in an ecosystem. Select the list that only contains abiotic factors.

• variety of food sources, annual precipitation, and number of decomposers

• the density of predators, water depth, types of parasites

• precipitation amount, number of prey species, plant types

• water temperature, amount of sunlight, soil type

Owls and snakes eat mice and other organisms. What would happen to the mice population if the owl population decreased?

• The population would decrease, as the loss of owls as part of their diet is a limiting factor.

• The population would decrease, as shelters created by owl nests is a limiting factor.

• The population would increase, as competition for food is a limiting factor.

• The population would increase, as predation by owls is a limiting factor.

What causes competition to occur in an environment?

• Good conditions make resources plentiful.

• Organisms struggle for a limited resource.

• Members of a population have different roles.

• A population falls below the environment’s carrying capacity.

Carrying Capacity is

• the capacity of what one person can carry per day 
• how many animals you have in your daily bag limit at the end of the year
• wildebeest at a watering hole with zebras
• the maximum number of individuals that the environment can support

MULTIPLE CORRECT: Which of the following are true about a keystone species?

• Is the GLUE that holds an ecosystem together.

• If it is removed, it will impact the structure and biodiversity of a habitat/ecostyem.

• It has NO impact on other organisms in an ecosystem.

• There is only 1 keystone species in every ecosystem.

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A side-effect when a certain species that usually helps to keep the entire ecosystem balanced is reduced or removed. When their numbers are changed there is an ecological imbalance.

• trophic level

• trophic cascade

• food web

• food chain

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Each step or level in a food chain or food web.

• trophic level

• trophic cascade

• food web

• food chain

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Starfish on shorelines will control mussels from overcrowding algae, limpets, anemones, and sponges by eating them. This helps maintain the biodiversity of the shore.

• predator

• prey

• plant

• ecosystem engineer

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in 1995 Wolves were reintroduced to Yellowstone National Park. Which answer below most accurately describes a possible trophic cascade the could result from the reintroduction of wolves?

• wolves reintroduced-> deer population increased -> tree and vegetation cover decreased

• wolves reintroduced-> beaver population decreased -> tree and vegetation cover increased

• wolves reintroduced-> deer population decreased -> tree and vegetation cover increased -> beaver population increased

• wolves reintroduced-> deer population decreased -> beaver population decreased -> songbird population increased

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How much energy is lost at each level of the energy pyramid?

• 20%

• 10%

• 90%

• 75%

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