Aquatic Food Web 10-09
Use the ocean food web diagram provided by your teacher to answer the following questions.
Trophic (Feeding) Levels and Food Webs:
1. Write the names of the producers:
2. Write the names of all primary consumers:
3. Write the names of all secondary consumers:
4. Write the names of all tertiary consumers:
5. List two of each of the following
Food Chains and Food Webs:
6. Define a Food Chain –
An example of a food chain from this aquatic food web is: Algae squid killer whale
7. Write 2 different examples of food chains from the aquatic food web starting with the producers.
8. How does a food chain differ from a food web?
9. Name 3 organisms that exist at more than one feeding level (they are primary and secondary consumer) in the
10. What possible advantage would an organism have if it fed at more than one level?
11. Which way do arrows in a food web point? Predict what the arrows represent and why they point in this
One of Barry Commoner’s 4 Laws of Ecology states: “Everything is connected to everything else.” For
the next 2 questions, predict SPECIFIC changes that will occur in populations levels of ALL (hint: there
are many changes) affected organisms if…
12. the Killer whales and Elephant Seals were hunted to extinction:
13. all the autotrophs die:
14. Based on your exploration and reading: Is there one group of organisms that is more important to this food web
than any other groups? Which group and why?
15. Imagine you are teaching third graders about food webs and food chains. How could you teach this to them so
they could grasp the difference between the two?
Be prepared to answer questions about this activity and take a quiz on the terms introduced in 2.3 and