7th grade unit 4 task 2 test review

In a grassland food web, which organism would be most directly impacted if a disease eliminated the mice population?

• Snakes

• Grasses

• Grasshoppers

• Hawks

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If a pond dries up due to a long period without rain, which group of organisms is most likely to be affected first?

• Snails

• Algae

• Turtles

• Herons

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Removing a species of plant from a lake ecosystem would be considered a change to the lake’s:

• Abiotic factors

• Biotic factors

• Climate

• Geology

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If a non-native vine overtakes an area and blocks sunlight from reaching native grasses, what is the most likely immediate consequence for insects that feed on those grasses?

• Sharp decline in their numbers

• Start eating the vine

• Population increases

• No effect

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After wolves were brought back to Yellowstone, beaver populations increased due to more available willow trees. What is this an example of?

• Biomagnification

• Trophic cascade

• Commensalism

• Parasitism

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Which of the following is an example of a biotic change?

• Flooding erodes riverbanks

• Lightning strikes a tree

• Invasive beetle destroys local trees

• Volcanic eruption covers land with ash

If sea otters are removed from their ecosystem, sea urchin populations increase and kelp forests are destroyed. What role do sea otters play in this ecosystem?

• Keystone species

• Producer

• Primary consumer

• Decomposer

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A food chain is grass → mouse → owl. What is most likely to happen if all the mice are removed?

• Owls will look for new food sources

• Grass will decrease

• Mice will become predators

• Owls will eat more grass

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Which graph would represent a population increasing rapidly without any limiting factors?

• Flat horizontal line

• Steep upward curve

• Straight line going down

• Curve that levels off at the top

After repeated farming, soil nutrients are depleted. Which of the following best describes nitrogen in this scenario?

• Herbivore

• Limiting factor

• Producer

• Consumer

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