Food Web Homework

All food webs and chains begin with an organism that is able to use sunlight to make its own food. These organisms occupy which trophic level?

• Producers

• Primary consumers

• Secondary consumers

• Tertiary consumers 

Which of the following will most likely result if all of the primary consumers are removed from this ecosystem?

• The robins would become herbivores, eating the plants.

• The earthworm and beetle populations would decrease.

• Plants will decrease.

• Fungi will consume moles.

 Prolonged periods of drought in an area cause decreases in plant population sizes. Which of the following statements describes how the decreases in plant population sizes then affect other populations in the area?

• Omnivore population sizes increase, and herbivore population sizes increase.

• Omnivore population sizes decrease, and carnivore population sizes increase.

• Herbivore population sizes increase, and carnivore population sizes decrease.

• Herbivore population sizes decrease, and carnivore population sizes decrease.

   

Based on the food web, which of the following organisms acts as both a primary consumer and a secondary consumer?

• Eagles

• Shorebirds

• Shrimp

• Phytoplankton

 A partial food web is shown below.

 

Which of the following will most likely occur if the grouse population decreases?

• The butterfly population will increase.

• The red-tailed hawk population will increase.

• Emigration of grizzly bears and deer will increase.

• Competition between grizzly bears and deer will increase.

Which of the following organisms is a producer?

• grass

• rabbit

• fox

• snake

What would happen to the rabbit population if the fox population moved out of the area represented by the food web?

• The rabbit population would increase

• The rabbit population would decrease

• The rabbit population would neither increase nor decrease

An organism that gets energy from breaking down dead organisms, non-living material or waste

• producer
• consumer
• decomposer
• autotroph

Which of the following would be the most likely effect, if there were a sudden increase in the cricket population?

• There would be a decrease in the small bird population.
• There would be a decrease in the grass/flowers population.
• There would be a decrease in the mice population.
• There would be an increase in the grass/flowers population.

How many herbivores are in this web?

• 1
• 2
• 3
• 4