Louisiana LEAP 2025 Biology: complete guide to the Louisiana Student Standards for Science, the four life-science core ideas, the three reporting categories, the item types, and the five achievement levels

The Louisiana LEAP 2025 Biology assessment is the statewide high school biology end-of-course (EOC) test, administered by the Louisiana Department of Education (LDOE). It measures the high school Biology performance expectations (the HS-LS codes) in the Louisiana Student Standards for Science (LSS). This page is the index: it explains the item types, the four life-science core ideas, the three reporting categories, 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 the Louisiana LEAP 2025 Biology test is

LEAP 2025 Biology is one of Louisiana's high school end-of-course assessments, taken when a student finishes the Biology course. It is built on the Louisiana Student Standards for Science for high school Biology. Those standards are three-dimensional: every standard is written as a performance expectation that blends a disciplinary core idea (the content), a science and engineering practice (such as developing a model or constructing an explanation), and a crosscutting concept (such as structure and function, or energy and matter).

Most students sit LEAP 2025 Biology in 9th or 10th grade, in a state testing window, with retake opportunities for students who need to test again. It is one of the LEAP 2025 high school assessments that count toward graduation in Louisiana (students must pass an end-of-course test in science or social studies, Biology or US History), and the score typically counts as a percentage of the final course grade, so it is treated as a major exam.

The item types

LEAP 2025 Biology is computer-based and uses a phenomenon-based, set-based design: most questions sit in an item set or a task built around a real science phenomenon, with several questions tied to shared stimulus materials, alongside stand-alone items. According to the LDOE assessment guide, the operational test contains 5 item sets, 1 task, and 16 stand-alone items, plus embedded field-test questions (one item set or task and four stand-alone items) that do not count toward your score and can appear in any session. Four item types appear:

• Selected Response (SR). Traditional multiple choice (four options, one correct answer) and multiple-select (more than one correct answer). Each SR item is worth 1 point.
• Technology-Enhanced (TE). Items that use the computer to capture a response, such as drag and drop, drop-down menus, and hot spots (clicking a region of an image). TE items are worth up to 2 points.
• Constructed Response (CR). A brief written response scored on a 2-point rubric.
• Extended Response (ER). A longer written response in the task, scored on a 9-point rubric. An extended response is built to address all three dimensions of a performance expectation.

Because the test is on a computer and built around phenomena, most items pair the question with a stimulus: a data table, a graph, a model or diagram (a cell, a food web, a pedigree, a Punnett square), or a short passage. The skill the test rewards is reading the stimulus and reasoning from it to the response, exactly as the three-dimensional standards intend.

The three reporting categories

LDOE reports Biology results in three reporting categories that group the science and engineering practices, so the score report tells you how well you reasoned, not just which topics you knew.

• Investigate. Asking questions, defining problems, and planning investigations.
• Evaluate. Analyzing and interpreting data, using mathematics and computational thinking, and engaging in argument from evidence.
• Reason Scientifically. Developing and using models, constructing explanations, and designing solutions.

Each performance expectation is reported under one of these categories. One expectation, HS-LS1-8 (relating photosynthesis and cellular respiration), may be assessed but is reported only in the overall score, because it touches all three categories rather than fitting neatly into one.

Format and scoring

Your raw score (the points you earn) is converted to a scale score for that test form, using an equating procedure so the standard is the same across forms. The scale score places you in one of five LEAP 2025 achievement levels.

• Advanced. The student has exceeded college and career readiness expectations and is well prepared for the next level of study.
• Mastery. The student has met the expectations and is prepared for the next level of study (this is the readiness goal).
• Basic. The student has nearly met the expectations and may need additional support.
• Approaching Basic. The student has partially met the expectations and will need much support.
• Unsatisfactory. The student has not yet met the expectations and will need extensive support.

Because the test mixes unscored field-test items in with the scored items to develop future forms, you cannot tell which is which, so answer every question carefully.

The four life-science core ideas

The Biology standards are organized under four disciplinary core ideas from life science. This library mirrors them as six modules so each content area gets the depth the test demands.

LS1: From Molecules to Organisms (Structures and Processes)

The largest content area: cell structure and how structure suits function, the cell membrane and transport, the cell cycle and cell division, the macromolecules and enzymes, photosynthesis, cellular respiration, and how feedback keeps an organism's internal conditions stable. This library splits LS1 across Module 1, Module 2, and Module 6.

LS2: Ecosystems (Interactions, Energy, and Dynamics)

Energy flow through food webs, the cycling of matter (the carbon and nitrogen cycles), carrying capacity and the factors that limit populations, and how biodiversity supports ecosystem stability, including human impact and solutions. This is Module 5.

LS3: Heredity (Inheritance and Variation of Traits)

The role of DNA and chromosomes in coding traits, protein synthesis, meiosis and the sources of genetic variation, Mendelian genetics and probability, and how mutations change proteins and traits. This is Module 3, with meiosis introduced in Module 1.

LS4: Biological Evolution (Unity and Diversity)

The evidence for common ancestry (anatomical, molecular, and fossil), the four factors of natural selection, adaptation, how populations change over time, classification and phylogeny, and biodiversity. This is Module 4.

The three dimensions, as a study checklist

Because the standards are three-dimensional, it helps to know the science and engineering practices the test can turn any topic into: asking questions, developing and using models, planning and carrying out investigations, analyzing and interpreting data, using mathematics and computational thinking, constructing explanations, engaging in argument from evidence, and communicating information. The crosscutting concepts that recur are patterns, cause and effect, scale and proportion, systems and system models, energy and matter, structure and function, 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 the Louisiana LEAP 2025 Biology test

1. Learn the content, then learn to use it. Master the biology for all four core ideas, but practice applying it: most items give you a phenomenon and a stimulus and ask you to do something with it.
2. Practice the science and engineering practices. Get comfortable developing and interpreting models, reading data tables and graphs, applying statistics and probability to inherited traits and to natural selection, and reasoning from evidence to a claim.
3. Drill the item formats. Use the LDOE practice test so multiple-select, drag-and-drop, drop-down, and hot-spot items feel familiar, and rehearse short and extended constructed responses against a rubric.
4. Connect structure to function and follow the energy. Across cells, organs, and ecosystems, the test rewards explaining how a structure suits its job and tracing how energy and matter move and change.
5. Treat LEAP 2025 as a graded assessment. Because it counts toward your course grade and toward graduation, 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 /la-leap/biology/syllabus.

Module 1: Cells and transport

cell theory and the types of cells, comparing prokaryotic and eukaryotic cells, cell structure and organelles, the cell membrane and transport, the cell cycle and mitosis, meiosis and genetic variation.

Module 2: Biochemistry and energy

the chemistry of life and water, the macromolecules of life, enzymes and activation energy, photosynthesis, cellular respiration.

Module 3: Genetics and heredity

DNA structure and replication, protein synthesis: transcription and translation, Mendelian genetics and Punnett squares, patterns of inheritance, mutations and genetic variation, biotechnology and genetic engineering.

Module 4: Evolution and classification

the evidence for common ancestry, natural selection and adaptation, speciation and population change, classification and phylogeny, biodiversity and its importance.

Module 5: Ecology and interdependence

energy flow and food webs, the cycling of matter, population dynamics and carrying capacity, ecosystem stability and resilience, human impact on ecosystems.

Module 6: The human body and homeostasis

homeostasis and feedback, levels of organization and body systems, transport and gas exchange in the body, the nervous and endocrine systems, the immune system and disease.

For the official guidance

LDOE publishes the Louisiana Student Standards for Science, the LEAP 2025 Assessment Guide for Biology, the Biology Achievement Level Descriptors, and the released-item and practice-test materials that show the exact look and difficulty of the test. Always study from the current LDOE materials, because the item formats, the achievement-level cut scores, and the graduation rules are specific to Louisiana.