Virginia SOL LS.9.c
The Standard
variations in biotic and abiotic factors can change ecosystems.
Virginia Standards of Learning for Science · The student will investigate and understand that relationships exist between ecosystem dynamics and human activity. Key ideas include
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students identify changes in living populations and nonliving conditions such as water, light, temperature, and soil. They trace how one change affects organisms, food webs, and habitats.
What Mastery Looks Like
- Students can classify a changed factor and predict several connected effects within an ecosystem. They support each prediction with evidence or a clear cause-and-effect chain.
Common Misconceptions
- Students may call dead leaves abiotic, even though they came from living organisms. They often predict only direct effects or assume every population changes in the same direction.
How to Assess It
- Exit ticket: “A pond receives less sunlight after trees grow along its bank. Classify the changed factor, then predict effects on algae and fish.”
Lesson moves
Ways to Teach It
Set up identical duckweed cups under different light levels, then count leaves over one week and graph the results.
Write how a drought could affect grass, rabbits, and hawks, using a three-step cause-and-effect chain.
Teams draw factor cards and race to build accurate chains showing effects on three parts of a food web.
Compare local stream photos and species counts before and after construction, then identify likely causes of the changes.
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Printable LS.9.c Worksheet
A ready-to-print activity worksheet aligned to LS.9.c, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- LS.9.b
disruptions in ecosystems can change species competition; and
- LS.7.a
biotic and abiotic factors define land, marine, and freshwater ecosystems; and
- LS.8.c
large-scale changes such as eutrophication, climate changes, and catastrophic disturbances affect ecosystems.
- LS.5
The student will investigate and understand that biotic and abiotic factors affect an ecosystem. Key ideas include
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