Cause & Effect Relationships in Ecosystems

What do green plants provide to a deer in an ecosystem?

• Shelter and water

• Food and oxygen

• Energy and minerals

• Food and carbon dioxide

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Which part of the nitrogen cycle returns nitrogen gas to the atmosphere?

• Excretion

• Decomposition

• Denitrification

• Photosynthesis

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What type of diagram best represents a heron eating a baby crocodile and an adult crocodile eating a heron?

• Circular food chain

• Food web

• Pyramid of numbers

• Linear food chain

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Which part of the water cycle is most likely to transport fertilizers from a farm to nearby water sources downstream?

• Precipitation

• Evaporation

• Transpiration

• Condensation

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What might cause a decrease in the squirrel population in a forest?

• Fewer predators in the area

• Increased competition with other nut-eating animals

• More food sources available to squirrels

• An increase in their nesting areas

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If the earthworm population disappeared from a food web, which animal would likely be most affected?

• Grasshopper

• Centipede

• Spider

• Ant

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Which change would likely have the greatest negative impact on an ecosystem?

• Adding a new species of plant

• Removing leaf litter and logs from the area

• Increasing predators for herbivores

• Introducing more water to the area

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Why might a population of caribou stabilize over time?

• The number of births equals the number of deaths

• There are more births than deaths

• The habitat becomes smaller

• Immigration is greater than births

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What is an example of an abiotic factor changing in an ecosystem?

• Increased plant growth

• More rainfall in the area

• More animals in the area

• Increased predator population

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Why do owls and rabbits have different eye placements?

• To help them find food in specific habitats

• As an adaptation for survival

• To balance population numbers

• For improved communication with other species

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