LS
39
Ecosystems Study Guide
Things to Study:
 Ecosystem Reading Guide LS 30
 Nitrogen Cycle Story LS 31
 Energy Flow Reading Guide LS 33
 Relationships Among Organisms LS 36
 Food Web Practice LS 37
 Own the Word Vocab in your
Reference Section
1. (LS 30)Includes both living and nonliving parts in an area. __________________________________
2. (LS 30)All members of one species in a area____________________________________________
3. (LS 30)Al the different populations that live together in an area make up a(n)________________
Organism
Population
Community
Ecosystem
4. (LS 30) Complete the diagram above to show the levels of organization in an ecosystem.
5. (LS 30) Name at least 3 non-living parts of your ecosystem
6. Mark each statement about matter and energy in ecosystems as True or False. For the
False statements, correct the sentence so that it is true.
________________(LS 33) The supply of matter in an ecosystem is limited.
_______________ (LS 33) Matter is recycled in an ecosystem.
________________(LS 33) Energy is recycled in an ecosystem.
________________ (LS 31)Most organisms use nitrogen directly from the air.
________________ (LS 31) The process of changing free nitrogen gas into a usable form of
nitrogen is called denitrification.
__________________ (LS 31)Most nitrogen fixation is performed by plants.
7. (LS 33) In the food web above there are many food chains. List one food chain from algae
to a killer whale.
8. What is the producer in the food web
above?
12. List the three omnivores.
9. List two Primary Consumers
13. List two carnivores
10. List two Secondary Consumers
14. Are there any herbivores in the food
web? Explain.
11. List one organism that is both a
primary consumer and a secondary
consumer.
15. Which organism seems to be the top
predator of this ecosystem?
16. Complete the chart below to describe different relationships among organisms in an
ecosystem.
Type of
Relationship
How Species Are Affected
Example
Mutualism
One species benefits, the other species is harmed.
One species benefits, the other species is harmed
Elk and Pronghorn both
each wheatgrass
The Gray Wolf and Elk
Word Bank:
Population
Community
Ecosystem
Producer
Herbivore
Omnivore
Carnivore
Producer
Autotroph
Heterotroph
Nitrogen fixation
Mutualism
Parasitism
Commensalism
Predation
Competition
Word Bank:
Population
Community
Ecosystem
Producer
Herbivore
Omnivore
Carnivore
Producer
Autotroph
Heterotroph
Nitrogen fixation
Mutualism
Parasitism
Commensalism
Predation
Competition
Word Bank:
Population
Community
Ecosystem
Producer
Herbivore
Omnivore
Carnivore
Producer
Autotroph
Heterotroph
Nitrogen fixation
Mutualism
Parasitism
Commensalism
Predation
Competition
Word Bank:
Population
Community
Ecosystem
Producer
Herbivore
Omnivore
Carnivore
Producer
Autotroph
Heterotroph
Nitrogen fixation
Mutualism
Parasitism
Commensalism
Predation
Competition
Word Bank:
Population
Community
Ecosystem
Producer
Herbivore
Omnivore
Carnivore
Producer
Autotroph
Heterotroph
Nitrogen fixation
Mutualism
Parasitism
Commensalism
Predation
Competition