Ecosystems Test

Which statement is true about Ecosystem A?

• The ecosystem is shallower than lakes.

• It is a freshwater ecosystem surrounded by land.

• It is a saltwater ecosystem that is divided by the continents.

• The temperature of water stays the same from top to bottom

Which statement best explains why there are a large amount of organisms in the shallower portions of Ecosystem A?

• A. Organisms have plenty of space to make their home.

• B. Organisms are well-protected in that zone of water.

• C. Organisms prefer to live in places frequently visited by humans.

• D. Organisms have plenty of food as more sunlight is available to producers.

What is a common feature between Ecosystem A and Ecosystem B?

• Both are freshwater ecosystems.

• Both are saltwater ecosystems.

• Both contain different plants and animals at different depths.

• Both contain a deep bottom zone where sunlight does not reach.

The striped bass is a type of fish that lives in Ecosystem B and that the heron eats as part of its diet. If all other environmental conditions remain the same, which event would occur if the striped bass population was to increase in Ecosystem B?

• The heron population would increase.

• The heron population would decrease.

• The bald eagle population would slowly decrease and then sharply increase.

• The bald eagle population would remain constant.

What is the role of a crab?

• Producer

• Consumer

• Decomposer

What is the role of a water lily?

• Producer

• Consumer

• Decomposer

What is the role of bacteria?

• Producer

• Consumer

• Decomposer

Alejandra goes on a trip during the spring with her family. They go for an afternoon nature hike, and Alejandra makes observations. She notices many different types of large trees, grasses and shrubs. She sees many small animals, like squirrels, rabbits, and foxes, and hears lots of birds. She also sees mushrooms on some fallen trees. Alejandra notices that the temperature is warm, but not too hot. Alejandra creates the following model for how energy flows through this ecosystem:

grass → rabbits → fox → hawk.

Alejandra makes the claim that her family is visiting a forest ecosystem. Which evidence would support Alejandra’s claim?

• There are many types of grasses but very few trees and shrubs.

• There are many tall trees and a variety of birds and animals.

• The temperature in the spring is very hot.

• The temperature in the spring is very cold.

What would happen in this food chain if the number of rabbits increased?

grass → rabbits → fox → hawk

Select all that apply.

• There would be more food for the foxes.

• The hawks' food would decrease.

• There would be no change in the food chain.

• The amount of grass would decrease.

Based on the food chain:

grass → rabbits → fox → hawk

How are the fox and the grass connected?

• The fox eats the rabbit for energy, and the rabbit depends on the grass for energy.

• The fox prepares food for the grass using the sun, and the grass gives water to the fox.

• The fox and the grass both use the sun to make their own food.

• The fox and the grass both use the rabbit for energy.