5.09 Test Study Guide: Ecology and the Environment

During the summer in the Arctic, mosquitoes breed exponentially. When winter comes, the population decreases dramatically due to a limiting factor.

What is most likely the limiting factor in this situation?

• no vegetation

• more sunlight

• excess of food

• colder temperatures

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Which element is an abiotic factor in a tropical rain forest?

• the top predator

• the rain

• the trees

• the plant life

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Which consequence occurred when sea otters were overhunted along the Pacific Coast?

• Kelp came to grow out of control.

• The sea urchin population was reduced to dangerous levels.

• The population of sea otters on the Pacific Coast went extinct.

• Many fish lost their habitats as kelp was destroyed by sea urchins.

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Which biome type occupies the largest area on earth?

• temperate grassland

• marine

• savanna

• desert

Ten square miles of temperate forest has a larger variety of organisms than 10 square miles of taiga.

What does the temperate forest have more of?

• It has fewer producers

• It has more abiotic factors

• It has more biodiversity

• It has very little succession

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Early one spring, a group of bird-watchers counted 30 different species of birds in a tract of forest. In the early spring two years later, the bird-watchers counted 15 species in the same area.

Which statement best summarizes this situation?

• The forest shows a decrease in biodiversity

• Human beings disrupt the presence of animals in ecosystems

• Birds follow different migratory paths each year

• It is important to study living things to better understand the earth

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Which order of energy flow in an ecosystem is accurate?

• Sun -> Bird -> Worm

• Sun -> Alga -> Small fish

• Grass -> Mouse -> Grasshopper

• Eagle -> Rabbit -> Grass

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 Which event would be the result if populations of producers in an ecosystem became unstable?

• Decomposers would become the primary energy source

• The number of primary consumers would decrease dramatically

• The direction of energy in the food web would change directions and flow toward the producers

• The energy flow into the food web would decrease or increase along with changing populations of producers

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Snakes eat bats. Hawks also eat bats. Bats and spiders eat moths. Moths eat nectar from plants.

When completely diagramed, what does this description represent?

• an ecosystem

• a food web

• a food chain

• a community

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The following flow of energy occurs in one ecosystem: alga → insect larva → flatworm → fish.

Which trophic level has the most energy to pass on to the next?

• alga

• insect larva

• flatworm

• fish

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