Ecosystems Final Test

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A rabbit depends on various plants in an ecosystem to survive. Which would most likely happen if a drought decreased the plant population?

• The rabbit population would increase.
• The rabbit population would decrease.
• The rabbit population would remain the same.
• The rabbit population would increase, then decrease quickly.

This diagram shows a simple ocean food chain. algae → fish → seal Which will most likely occur if the fish population decreases?

• The algae and seal populations will increase.
• The algae and seal populations will decrease.
• The algae population will increase, and the seal population will increase.
• The algae population will increase, and the seal population will decrease.

• The amount of algae would increase and the number of bass would increase.
• The amount of algae would decrease and the number of bass would increase.
• The amount of algae would increase and the number of bass would decrease.
• The amount of algae would decrease and the number of bass would decrease.

Why are animals like deer, raccoons, bears, and coyotes sometimes seen in neighborhoods?

• because it is easier to find food
• because they can escape predators
• because their habitats are increasing
• because their habitats are decreasing

The diagram below is a simple grassland food chain. grass → mouse → snake If a predator of the snake were introduced to the ecosystem, which would most likely happen?

• The grass population would increase.
• The snake population would increase.
• The mouse population would increase.
• The mouse population would decrease.

What is the primary source of energy in many ecosystems?

• water
• the sun
• consumers
• producers

Who would be most affected if the number of producers in the ocean decreased?

• carnivores
• herbivores
• decomposers

What would most likely happen if there were no plants left in an ecosystem?

• All life within the system would suffer.
• Some life within the system would suffer.
• Herbivores would have to become carnivores.

Which best explains why the sun is important to all ecosystems?

• It provides heat.
• It provides daylight.
• Producers rely on it to make their food.