Ecosystem Gizmos

American Bison eat grass. What kind of organism are they?

• Producer

• Herbivore

• Carnivore

• None of the above

Owls eat voles (a relative of mice); voles eat grass and seeds. Which food chain is correct?

• Grass → Vole → Owl

• Grass → Owl → Vole

• Vole → Owl → Grass

• Vole → Grass → Owl

Dry weather is followed by wet weather, causing grass growth. How does this affect animal pops?

• Only the prairie dog population will increase

• Only the ferret population will increase

• Only the fox population will increase

• Pops of prairie dogs, ferrets and foxes will all increase

Snakes eat frogs, and hawks eat snakes. If hawk pop decreased, what happens to frogs?

• The frog population would increase

• The frog population would decrease

• The frog population would stay the same

• Frog pop would increase, then decrease as hawk pop recovered

There are trogs, squirts, and zinks. The trog pop grew, squirts decreased, and the zinks increased. What's the food chain?

• Squirt → Zink →Trog

• Trog → Squirt → Zink

• Squirt → Trog → Zink

• Zink → Trog → Squirt

Temp. of 4 ponds was measured at 6AM. Which pond would have most dissolved oxygen concentration?

• Pond A (started at 15C)

• Pond B (started at 22C)

• Pond C (started at 25C)

• Pond D (started at 31C)

At what time of day are dissolved oxygen levels most likely to be highest?

• 6:00am

• 12:00pm (noon)

• 6:00pm

• 12:00am (midnight)

Which of the following would most likely occur if the oxygen in a pond decreased?

• Fish would grow larger

• Fish would die

• The temperature of the pond would decrease

• The pond would dry up

Which would increase the amount of dissolved oxygen in a pond?

• a. Removing plants

• b. Removing fish

• c. Adding plants

• d. Both B and C are correct

4 men fished in different ponds. Whose fish came from pond w/ highest level of dissolved oxygen?

• Catch A (total weight: 1.5 kg)

• Catch B (total weight: 25.6kg)

• Catch C (total weight: 7.7kg)

• Catch D (total weight: 6.8kg)