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Biology Ecological Systems
Chapter 3 Section 3: Energy Flow in Ecosystems
[10] SC3. 2 exploring ecological relationships (e.g., competition, niche, feeding relationships,
symbiosis) (L)
Vocabulary: Define the following in your own words.
Food Chain:
Food Web:
Trophic Level:
Ecological Pyramid:
1. Look at Figure 3-7. What is the ultimate source of energy from this food chain?
2. Using Figure 3-7 as a model, Identify a food chain in Bristol Bay. Make sure to include a
Primary Producer, a Herbivore and a Carnivore.
3. Look at Figure 3.9. Construct a food web with at least TWO Primary Producers, TWO
Herbivores, ONE Scavenger , and TWO Omnivores. (You can use pictures or just the
names of the animals)
4. What is the purpose for Decomposers and Detrivores in the food web?
5. Look at Figure 3-10. What do ecologists mean when they say that killer whales
indirectly depend on krill for survival?
6. Using Figure 3-12 as an example, draw a pyramid of biomass and numbers for some
plants and animals in Bristol Bay.
7. What tropic level would low bush cranberries? What percentage of their energy do they
get from the sun?
8. What is the tropic level of a wolf? What percentage of their energy do they get from sun
light stored in primary producers?
9. What tropic level has the most biomass?