SNC1D - Ecosystems
Name: ___________________
Page: ____
Food Webs, Food Chains and Trophic Levels Worksheet V2
(Read Pearson p 30-31)
1. Here is a food chain with a tadpole.
Algae
Tadpole
Water Boatman
Yellow Perch
Decomposing
Bacteria
a. Label each of the species above as a producer or consumer.
b. Label as a decomposer, herbivore, omnivore, carnivore or none of these.
c. What is the purpose of a decomposer?
d. What is the importance of detritus?
2.
Identify the trophic levels for each of the aquatic food chain organisms shown in Fig 1.29 p 31.
Name of organism
Trophic Level
SNC1D - Ecosystems
Name: ___________________
Page: ____
3a. Draw a food web that includes the domestic plants corn, wheat, grass and the domestic
animals cows, chickens, and pigs. Have a labeled sketch for each item. Now make the food
web bigger - add a human and a few pests that eat the plants too.
b.
Write the longest food chain in your food web. What is the maximum trophic level
possible?
c.
Biodiversity is total number of different organisms in an ecosystem. Compare the
biodiversity of a farm food web to the boreal forest food web on p 31 of the handout.
d.
Energy efficient systems have the least amount of input energy (food) to get work done.
Describe the most efficient way for the human to eat and get the most energy from the
food.
4.a)
Explain the difference between scavengers and carnivores.
b)
Explain the difference between predator and prey.
SNC1D - Ecosystems
Name: ___________________
Page: ____
squid
Use the aquatic food web in the diagram above to answer the following questions.
5a)
Identify the producer(s).
b)
Write a food chain with seven trophic levels. Remember the arrows.
c)
Name the top carnivore.
d)
List four secondary consumers.
e)
What trophic level do the secondary consumers belong to?
f)
What top level predator is missing from the diagram? Hint: Who eats whale meat?