Food Chains, Food Webs and Energy Pyramids

The path of food energy in an ecosystem from plants to animals.

• omnivore

• food chain

• producer

• consumer

This diagram shows how energy flows through an eco-system. What is the first source of energy in this pyramid?

• sharks and large birds

• algae, plankton and seagrass

• herbivorous fish, crustaceans and sea urchins

• seals and carnivorous fish

Which organism is the carnivore?

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• 
• 
• 

Which organism is the omnivore?

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• 
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How many carnivores are shown in this food web?

• 6

• 4

• 5

• 3

Only about ten percent of the energy stored in an organism can be passed on to the next trophic level. Of the remaining energy, some is used for the organism’s life processes, and the rest is typically...

• used in reproduction

• stored as body fat

• stored as body tissues

• converted to heat and lost

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

• 10%
• 50%
• 90%
• 100%

Which organism recieves the least amount of energy from the producer?

• Owl
• Grasshopper
• Lilypad
• Mouse

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

• Hawk
• Spider
• Grasshopper
• Shrew

Which level will contain plants?

• A
• B
• C
• D