Food Chains, Webs and Energy Pyramids

Which organism do the owl and the weasel compete for in the food web?

• Hawk
• Spider
• Grasshopper
• Shrew

What might happen if you remove a primary consumer from the ecosystem?

• There would be more food for secondary consumers.
• The number of primary consumers would increase.
• The number of plants would increase.
• The number of secondary consumers would increase.

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 primary consumers are there in this food web?

• 1
• 2
• 3
• 4

What percentage of energy is passed on to each tropic level?

• 10%
• 50%
• 90%
• 100%

How do producers obtain energy?

• They conduct photosynthesis.
• They consume plants.
• They consume primary consumers.
• They consume secondary consumers.

A food web can be broken down into several seperate

• food chains
• food pyramids
• producers
• consumers

Use the diagram to answer the question.
What is a fitting description for this diagram?

• A Food Chain
• An Ecosystem
• A Food Web
• Biotic and Abiotic Factors

Use the diagram to answer the question.
The Mayfly is a food source for which 3 organisms?

• Frog, Dragon Fly and snake
• Frog, trout and dragon fly
• Frog, salamander and trout
• Frog and phytoplankton

Bacteria and fungi typically serve what role in an ecosystem?

• herbivore
• carnivore
• omnivore
• decomposer