GEDStudy Topic
GED Science Foundations Study Guide
Interpret scientific investigations and practice introductory life, physical, and Earth-science relationships.
Topic Overview
Understand how a claim is tested
Identify the factor changed, the outcome measured, and the conditions kept comparable. An untreated group can show ordinary growth without a fertilizer. Repeated trials reveal whether a result is consistent, while random variation and systematic error require different interpretations. A single study supports conclusions only within the scope of its design and evidence.
Use relationships with units
Density is mass divided by volume, average acceleration is change in velocity divided by time, and work by a constant force in the direction of motion is force times distance. In a closed ordinary chemical reaction, substances may change while total mass remains constant. A physical change such as evaporation changes state without changing water into a new chemical substance.
Read models as models
Simple inheritance models describe probabilities, not guaranteed outcomes in every small group. Natural selection concerns differences in survival and reproduction of inherited variants over generations, not a decision by an individual to change its genes. Food chains show feeding relationships but do not capture every interaction in an ecosystem. For data questions, calculate the requested comparison and distinguish a measured result from an assumption about what might happen next.
- Confusing the manipulated factor with the measured response.
- Treating a probability as a guarantee for a small group.
- Claiming causation from a correlation alone.
- Assuming a physical change must create a new substance.
Checkpoint Quiz
Test your understanding of GED Science Foundations
These questions are for study practice only and are not official exam questions.
1. A student changes the amount of sunlight given to seedlings and measures their height after two weeks. What is the measured dependent variable?
2. A food web includes algae eaten by small fish, which are eaten by herons. In this chain, which organism is the producer?
3. An experiment measures 4, 6, and 8 seconds for three trials. What is the mean time?
4. A test predicts that salt lowers the freezing point of water. Which comparison best tests this prediction?
5. Which structure contains most of the genetic material in a typical human body cell?
6. Why should a scientist include an untreated comparison group when testing a plant fertilizer?
7. A trait is modeled by alleles B and b, with B dominant. Two Bb parents are crossed. What fraction of offspring is expected to be bb?
8. In a simple electric circuit, what is the function of an open switch?
9. A scientist compares rock layers at an undisturbed site. Which general principle helps infer their relative ages?
10. Which change would most directly increase evaporation from an open dish of water, with other factors held constant?
Frequently asked questions
What is a dependent variable?
It is the response measured to assess the effect of conditions in an investigation.
Why include a comparison group?
It provides a baseline against which the treatment result can be evaluated.
What does conservation of mass mean here?
In a sealed ordinary chemical system, total mass remains constant even when substances react.
How should I use a scientific model?
Apply its stated assumptions and avoid claiming more than the model and evidence support.
