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Energy & Matter in Ecosystems

by Melissa Cornish

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Energy & Matter
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in Organism and Ecosystems
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Unit Textbook
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7th Grade - Mrs. Cornish
AR State Standards
 
7-LS1-6 – Construct a scientific explanation based on evidence for the role of photosynthesis in the cycling of matter and flow of energy into and out of organisms.

7-LS1-7 – Develop a model to describe how food is rearranged through chemical reactions forming new molecules that support growth and/or release energy as this matter moves through an organism.
 
7-LS2-1 – Analyze and interpret data to provide evidence for the effects of resource availability on organisms and populations of organisms in an ecosystem.
 
7-LS2-3 – Develop a model to describe the cycling of matter and flow of energy among living and nonliving parts of an ecosystem.
 
7-LS2-4 – Construct an argument supported by empirical evidence that changes to physical or biological components of an ecosystem affect populations.
Table of Contents
Standards . . . . . . . . . . . . . . . . . . . . . . . . . . .

Abiotic Factors . . . . . . . . . . .. . . . . . . . . . . . .

Biotic Factors . . . . . . . . . . . . . . . . . . . . . . . .

Limiting Factors . . . . . . . . . . . . . . . . . . . . . .

Populations/Community . . . . . . . . . . . . . . .

Symbiosis . . . . . . . . . . . . . . . . . . . . . . . . . . .

Food Energy . . . . . . . . . . . . . . . . . . . . . . . . . .

Food Chain . . . . . . . . . . . . . . . . . . . . . . . . . . .

Food Web . . . . . . . . . . . . . . . . . . . . . . . . . . .

Questions . . . . . . . . . . . . . . . . . . . . . . . . . . .

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Abiotic Factors
Ecosystems contain all the nonliving and living parts of the environment in a given area. The nonliving parts of an ecosystem are called abiotic factors. They include sunlight, water, soil, and air. The abiotic factors of an ecosystem, such as those in the wetland shown below, determine what kinds of organisms can live there.
Biotic Factors
The living or once-living parts of an ecosystem are called biotic factors. These factors include living organisms, wastes produced by living organisms, and the decayed remains of dead organisms.
Limiting Factors
Populations can increase or decrease in size. What do you think keeps populations from becoming too large? Limiting factors are factors that can limit the growth of a population. The amounts of available water, space, shelter, and food affect a population's size. With too few resources, some individuals cannot survive. Other factors, like predation, competition, and disease, can also limit how many individuals survive.
EXTENDED CAPTION Limiting Factors in an ecosystem - Any biotic or abiotic factor that restricts the number or production of organisms is a limiting factor.
 
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