Ohio Biology EOC: complete guide to Ohio's Learning Standards for Science, the four Biology strands, the item types, and the five performance levels

Ohio's State Test for Biology is the statewide high school biology End-of-Course (EOC) exam, administered by the Ohio Department of Education and Workforce (ODEW). It measures the high school Biology content statements in Ohio's Learning Standards for Science, organized under four strands with the codes B.C (Cells), B.H (Heredity), B.E (Evolution), and B.DI (Diversity and Interdependence of Life). This page is the index: it explains the item types, the four strands, the format and scoring, and how to study each content area. The content is organized here into six modules that cover all of the Biology standards in depth.

What Ohio's Biology EOC is

The Biology EOC is one of Ohio's End-of-Course state tests, taken when a student finishes the matching course. It is built on Ohio's Learning Standards for Science for high school Biology and the related science model curriculum, which ODEW also uses to develop items. The Biology Test Specifications are the blueprint: they set the range and distribution of items and points across the four strands and give the rules item writers follow.

Most students sit the Biology EOC in 9th or 10th grade, online in a state testing window, with retake opportunities for students who need to test again. The score earns graduation points and can count toward a diploma seal (see below), so the Biology EOC is part of Ohio's graduation system, not a low-stakes practice test.

The item types

The Biology EOC is computer-based, delivered online through the Ohio State Assessment Portal, and every item is machine-scored. There is no essay on the science EOC. Several item types appear:

• Multiple choice. A question with four answer options and exactly one correct answer.
• Multi-select. A question that asks you to choose more than one correct answer from a list. These are usually scored all-or-nothing, so read how many answers the prompt wants.
• Technology-enhanced items (TEIs). Items that use the computer to collect a response in a richer way: drag-and-drop (place labels on a diagram or match terms), ordering or sequencing (put steps in the right order), table completion, graphing, and hot spot (click a region of an image).

Because the test is on a computer, many items pair the question with a stimulus: a data table, a graph, a labelled diagram (a cell, a food web, a pedigree, a Punnett square), or a short passage. The skill the EOC rewards is not just recall; it is reading the stimulus and reasoning from it to the correct response. Students can log in as a guest on the Ohio State Assessment Portal to try every item type before test day.

Format and scoring

Your raw score (the number of points you earn) is converted to a scale score, which places you in one of five performance levels.

• Limited. The lowest level, below the standard (worth 1 graduation point).
• Basic. Approaching the standard (worth 2 graduation points).
• Proficient. Meets the standard; begins at a scale score of 700 (worth 3 graduation points).
• Accelerated. Above the standard (worth 4 graduation points).
• Advanced. The highest level (worth 5 graduation points).

The blueprint mixes a small number of unscored field-test items in with the scored items to build future tests. You cannot tell which is which, so answer every question carefully.

How the Biology EOC counts toward graduation

Ohio's graduation rules have changed over time, and Biology plays more than one role.

In the legacy 18-point pathway, Biology is one of seven End-of-Course tests (with Algebra I, Geometry, English I, English II, American History, and American Government). Each test earns 1 to 5 graduation points based on the performance level, and a student needs at least 18 points in total, with minimums by subject area.

For the classes of 2023 and beyond, the competency requirement for graduation is met through the Algebra I and English II EOCs (each with a competency cut score of 684), not Biology. Even so, students still take the Biology EOC: ODEW notes that all schools must give the Biology EOC to all students to satisfy federal testing requirements, and a Proficient score (700 or higher) is one of the ways to earn the State Seal of Science. So the Biology EOC is required and reported, and it can unlock a seal, even though it is not the competency test.

The four Biology strands

The Biology standards are organized under four strands. This library mirrors them as six modules so each content area gets the depth the test demands.

B.C: Cells

Cell structure and how it fits function, the membrane and transport, cell division (the cell cycle and mitosis), and the cellular processes that sustain life (photosynthesis and cellular respiration). This is Module 1.

B.H: Heredity

Genes as segments of DNA on chromosomes, the molecular structure of DNA and how it codes for proteins, mutations, meiosis, and Mendelian inheritance. This library splits Heredity across Module 2 (the molecular side: DNA, protein synthesis, mutations) and Module 3 (meiosis, Punnett squares, inheritance patterns, and biotechnology).

B.E: Evolution

Natural selection as a primary mechanism of change, how species change over time, speciation and extinction, and the lines of evidence for common ancestry. This is Module 4.

B.DI: Diversity and Interdependence of Life

Classification and phylogeny, biodiversity as a product of evolution, the biotic and abiotic structure of ecosystems, the cycling of matter through food webs, and the flow of energy that sustains an ecosystem. This library splits B.DI across Module 5 (classification, phylogeny, and biodiversity) and Module 6 (ecosystems, energy, matter cycling, and human impact).

The science practices, as a study checklist

Ohio's standards ask you to do science, not just memorize it, so the EOC can turn any topic into a task. Be ready to develop and use models, analyze and interpret data from a table or graph, use mathematics (for example a Punnett-square probability or a ratio), construct explanations from evidence, and argue from evidence. The crosscutting ideas that recur are structure and function, energy and matter, cause and effect, systems and system models, and stability and change. Whenever you study a topic, ask how the test could turn it into a model to interpret, a graph to read, or a claim to support with evidence.

How to study Ohio's Biology EOC

1. Learn the content, then learn to use it. Master the biology for all four strands, but practice applying it: most items give you a stimulus and ask you to do something with it.
2. Practice the science practices. Get comfortable interpreting models, reading data tables and graphs, completing Punnett squares, and reasoning from evidence to a claim.
3. Drill the technology-enhanced formats. Use the Ohio State Assessment Portal so drag-and-drop, multi-select, ordering, and table-completion items feel familiar before test day. A multi-select is all-or-nothing, so check how many answers it wants.
4. Connect structure to function and follow the energy. Across cells, organisms, and ecosystems, the exam rewards explaining how a structure suits its job and tracing how energy and matter move and change.
5. Treat the EOC as a graded, graduation assessment. Because it earns graduation points and can unlock the State Seal of Science, study for it the way you would for a major exam.

The modules, standard by standard

Each topic has a standard-level answer page with worked exam questions and cross-links, plus a deep-dive guide and a quiz. Browse the set at /oh-eoc/biology/syllabus.

Module 1: Cells and cellular processes

cell theory and the types of cells, cell structure and organelles, the cell membrane and transport, the cell cycle and mitosis, photosynthesis, cellular respiration.

Module 2: Molecular genetics

DNA structure and replication, chromosomes, genes, and alleles, protein synthesis: transcription and translation, gene expression and regulation, mutations and genetic variation.

Module 3: Heredity and inheritance

meiosis and genetic variation, Mendelian genetics and Punnett squares, patterns of inheritance, pedigrees and sex-linked traits, biotechnology and genetic engineering.

Module 4: Evolution and natural selection

natural selection and adaptation, the evidence for evolution, speciation and isolation, population genetics and Hardy-Weinberg, patterns of evolution.

Module 5: Diversity and classification

classification and taxonomy, phylogeny and cladograms, the domains and kingdoms, biodiversity and its value, adaptations and niches.

Module 6: Ecology and interdependence

ecosystems and levels of organization, energy flow and food webs, the cycling of matter, population dynamics and carrying capacity, species interactions, ecosystem stability and human impact.

For the official guidance

ODEW publishes Ohio's Learning Standards and Model Curriculum for Science, the Biology state-tested course resources (with the Biology Test Specifications and released items), and the graduation-points guidance. Always study from the current ODEW materials, because the item formats, the performance-level cut scores, and the graduation rules are specific to Ohio.