7th Grade Science
Chapter 1 and Chapter 2 (Section 1) Review Sheet
Vocabulary
 Ecosystem
 Biotic factors
 Abiotic factors
 Habitat
 Species
 Population
 Community
 Ecology
 Population density
 Limiting factor
 Carrying capacity
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Natural selection
Adaptation
Niche
Competition
Predation
Predator
Prey
Symbiosis
Mutualism
Commensalism
Parasitism
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Parasite
Host
Producer
Consumer
Herbivore
Carnivore
Omnivore
Scavenger
Decomposer
Food chain
Food web
Other Topics to Know
 Be able to list or identify biotic and abiotic factors. List three of each here:
 Know the levels of organization in an ecosystem:
organismpopulationcommunityecosystem
 Know the population density formula, and be able to calculate population density if given
the total population and total sample area (like we did in the sampling technique lab). Write
the population density formula here:
 Know the different types of sampling techniques (direct observation, indirect observation,
and quadrat sampling), and when to use each (don’t worry about mark-and-recapture)
 Know the factors that cause a population to increase or decrease in size. List those factors
here:
 When does overpopulation occur?
 Be able to determine the carrying capacity of an ecosystem based on a graph
 Be able to identify predator and prey adaptations from a given list. List three predator
adaptations and three prey adaptations here:
 Be able to identify a given scenario as one of the three types of symbiosis: mutualism,
commensalism, or parasitism. Explain the difference between these types of symbiosis
below:
 Know the two ways an organism’s energy role is determined. List those ways here:
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Energy enters most ecosystems as __________________.
Be able to identify a producer in a given food chain
Be able to identify a primary and secondary consumer in a given food chain
Be able to identify a producer in a given food web
Be able to identify a primary and secondary consumer in a given food web
Be able to describe the effect of increasing or decreasing the population of one organism in
a food chain/web
 In a food chain, only ______% of the energy is passed from one level to the next.