Develop and use models to explain and predict, judging their merits and limitations, and obtain, evaluate, and communicate scientific information from reliable sources (Virginia 2018 Biology SOL BIO.1.e, BIO.1.f).

What this topic is asking

Virginia Biology SOL standard BIO.1 closes with two practices: BIO.1.e, developing and using models, and BIO.1.f, obtaining, evaluating, and communicating scientific information. The Biology EOC uses many models as stimuli (diagrams of cells, food webs, pedigrees, DNA), and it asks you to interpret them and to recognize their limits. It also tests the nature of science: what a scientific theory is, how evidence builds knowledge, and how to judge whether a source is reliable.

What a model is and why scientists use them

Models do two jobs the SOL tests. They explain: a diagram of the cell membrane shows how the phospholipid bilayer is arranged. And they predict: a Punnett square predicts the ratio of offspring, and a population model predicts how numbers will change. Many EOC items give you a model and ask you to read it or use it to make a prediction.

The merits and limitations of models

A bead model of DNA helps you see base pairing but does not show the real chemical bonds, the true scale, or the way the molecule unzips and copies. A good scientist (and a good SOL answer) can state both what a model shows well and where it falls short. The standard explicitly asks you to evaluate the merits and limitations of models.

The nature of science: hypothesis, theory, and law

In everyday speech "theory" can mean a guess, but in science it means the opposite. The terms form a ladder of confidence:

• A hypothesis is a testable, proposed explanation or prediction for a specific observation.
• A scientific theory is a broad, well-substantiated explanation of some aspect of the natural world, supported by a large body of evidence from many investigations. Cell theory and the theory of evolution are examples; they are among the most reliable knowledge science has.
• A scientific law describes a consistent pattern in nature, often mathematically, but does not by itself explain why.

Scientific knowledge is durable, but it is also open to revision: if strong new evidence contradicts an idea, scientists change it. This self-correcting quality is a strength, not a weakness, and the SOL tests whether you understand it.

Evaluating and communicating information

BIO.1.f asks you to gather information from multiple authoritative sources, compare and evaluate it, and communicate findings clearly. A reliable source is one that is peer-reviewed, from a recognized scientific body, current, and free of obvious bias or a conflict of interest. Communicating well means presenting data honestly with clear tables, graphs, and labeled diagrams, and not overstating what the evidence shows. The EOC may ask you to judge which of several sources is most trustworthy.

Try this

Q1. Explain the difference between a hypothesis and a scientific theory. [2]

• Cue. A hypothesis is a testable prediction for a specific observation; a theory is a broad explanation supported by a large body of evidence from many investigations.

Q2. Why is it a strength of science that a theory can be revised? [1]

• Cue. Because science is self-correcting: revising ideas in light of strong new evidence keeps explanations accurate.