Gizmos: Food Chain

The Food Chain Gizmo shows a food chain with hawks, snakes, rabbits, and grass. In this simulation, the hawks eat snakes, the snakes eat rabbits, and the rabbits eat grass.

1

Producers are organisms that do not need to eat other organisms to obtain energy. Click on all the producers in the food chain.

Grass--> Rabbit--> Snake--> Hawk

1

Consumers are organisms that need to eat other organisms to obtain energy. Click on all the consumers in the food chain.

Grass--> Rabbit--> Snake--> Hawk

You will need to look at the Gizmo in orde to answer the following questions.

1

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of hawks?

1

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of snakes?

1

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of rabbits?

1

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of grass?

Get the Gizmo ready. Click on the Reset button. Check that the BAR CHART TAB is selected. .

You are going to first test how increasing and decreasing the rabbit population will affect the other organisms. Add rabbits until the population is around 5000. Click Play, and then Pause after approximately ONE month.

1

Increasing the rabbit population caused the grass to

1

Increasing the rabbit population caused the snakes to

1

Increasing the rabbit population caused the hawks to

Click Reset and then decrease the rabbit population (to about 1000). Click Play, and then Pause after approximately ONE month.

1

Decreasing the rabbit population caused the grass to

1

Decreasing the rabbit population caused the snakes to

1

Decreasing the rabbit population caused the hawks to

3

Explain why decreasing the rabbit population caused the snake and hawk population to change.

Change the Snake Population.  Click the reset button. Add snakes until the population is around 400. Click Play, and then Pause after approximately ONE month.

1

Increasing the snake population caused the grass to

1

Increasing the snake population caused the rabbits to

1

Increasing the snake population caused the hawks to

2

Explain why increasing the snake population caused the rabbit and hawk population to change.

Click the reset button. Remove snakes until the population is around 100. Click Play, and then Pause  after approximately ONE month

1

Decreasing the snake population caused the grass to

1

Decreasing the snake population caused the rabbits to

1

Decreasing the snake population caused the hawks to

2

Explain why decreasing the snake population caused a change in the amount of grass.

2

If the number of hawks doubles, what will happen to the number of rabbits? Explain your answer. (Try the simulation before answering)

2

Gizmos: Food Chain

Producers are organisms that do not need to eat other organisms to obtain energy. Click on all the producers in the food chain.Grass--> Rabbit--> Snake--> Hawk

Consumers are organisms that need to eat other organisms to obtain energy. Click on all the consumers in the food chain.Grass--> Rabbit--> Snake--> Hawk

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of hawks?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of snakes?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of rabbits?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of grass?

Increasing the rabbit population caused the grass to

Increasing the rabbit population caused the snakes to

Increasing the rabbit population caused the hawks to

Decreasing the rabbit population caused the grass to

Decreasing the rabbit population caused the snakes to

Decreasing the rabbit population caused the hawks to

Explain why decreasing the rabbit population caused the snake and hawk population to change.

Increasing the snake population caused the grass to

Increasing the snake population caused the rabbits to

Increasing the snake population caused the hawks to

Explain why increasing the snake population caused the rabbit and hawk population to change.

Decreasing the snake population caused the grass to

Decreasing the snake population caused the rabbits to

Decreasing the snake population caused the hawks to

Explain why decreasing the snake population caused a change in the amount of grass.

If the number of hawks doubles, what will happen to the number of rabbits? Explain your answer. (Try the simulation before answering)

In general, what effect did removing prey have on predators?

Producers are organisms that do not need to eat other organisms to obtain energy. Click on all the producers in the food chain.Grass--> Rabbit--> Snake--> Hawk

Consumers are organisms that need to eat other organisms to obtain energy. Click on all the consumers in the food chain.Grass--> Rabbit--> Snake--> Hawk

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of hawks?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of snakes?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of rabbits?

The SIMULATION pane of the Gizmo shows the current population, or number, of each organism in the food chain. What is the current population of grass?

Increasing the rabbit population caused the grass to

Increasing the rabbit population caused the snakes to

Increasing the rabbit population caused the hawks to

Decreasing the rabbit population caused the grass to

Decreasing the rabbit population caused the snakes to

Decreasing the rabbit population caused the hawks to

Explain why decreasing the rabbit population caused the snake and hawk population to change.

Increasing the snake population caused the grass to

Increasing the snake population caused the rabbits to

Increasing the snake population caused the hawks to

Explain why increasing the snake population caused the rabbit and hawk population to change.

Decreasing the snake population caused the grass to

Decreasing the snake population caused the rabbits to

Decreasing the snake population caused the hawks to

Explain why decreasing the snake population caused a change in the amount of grass.

If the number of hawks doubles, what will happen to the number of rabbits? Explain your answer. (Try the simulation before answering)

In general, what effect did removing prey have on predators?

Producers are organisms that do not need to eat other organisms to obtain energy. Click on all the producers in the food chain.

Grass--> Rabbit--> Snake--> Hawk

Consumers are organisms that need to eat other organisms to obtain energy. Click on all the consumers in the food chain.

Grass--> Rabbit--> Snake--> Hawk

Producers are organisms that do not need to eat other organisms to obtain energy. Click on all the producers in the food chain.

Grass--> Rabbit--> Snake--> Hawk

Consumers are organisms that need to eat other organisms to obtain energy. Click on all the consumers in the food chain.

Grass--> Rabbit--> Snake--> Hawk