SNC1D - Sustainable Ecosystems
RHSA
Food Webs, Food Chains and Trophic Levels Worksheets
(Read Pearson p 32-33)
Use the food web in the diagram above to answer the following questions.
1.
Identify the autotrophs.
2.
Write a food chain with seven trophic levels. Remember the arrows.
3.
Name the top carnivore.
4.
List four secondary consumers.
5.
What trophic level do the secondary consumers belong to?
6.
What top level predator is missing from the diagram? Hint: Who eats whale meat?
SNC1D - Sustainable Ecosystems
7.
RHSA
a. Draw a food web that includes the domestic plants corn, wheat, grass and the domestic
animals cows, chickens, and pigs. Be sure to include a human and a few pests that eat
the plants too.
b. Write the longest food chain. 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. Describe the most efficient way for the human to eat and get the most energy from
the food.
SNC1D - Sustainable Ecosystems
8.
RHSA
a) Copy the energy pyramid shown in Fig 1.32 and draw on the organisms from the boreal
food web (fig 1.30) at the correct trophic levels.
b) What decomposers would be found in this ecosystem?
c) Are decomposers considered to be producers or consumers? Explain.
9.
Describe how the caterpillar shown on p 32 uses the energy eaten from the leaf.
10.
The producers in this farm energy
pyramid capture 100,000 J of
energy from the Sun.
a) How many joules of energy are
in the lambs?
b) How many joules of energy are
in the humans when they eat
lamb?