Use these targets, vocabulary, rubrics, examples, and score sheet with the instructor's approved lesson and procedure. This is an assessment companion, not a complete lesson or safety authorization.
Student lessons, data, and public practice answers (not assessment keys): Unit 06 learning pathway.
The student demonstrates the following:
Five science criteria plus separately reported integration (Page 3).
Open the frog; locate and name each structure on the specimen.
The student names each structure and its function on sight (Page 4).
Specimen, structures found, and a labeled sketch kept distinct.
You are making a decision, not adding up points. For each criterion, decide whether the work is Developing, Proficient, or Mastery — the column language tells you which. Technique criteria are mastered only when an educator observes them; identification and explanation criteria can be mastered on the approved specimen, image, model, or virtual route without penalty. Each student has three tokens per term; each token retries one rubric criterion. Approved accommodations, equipment failures, and approved absences are handled separately and do not consume these tokens.
Accept listed synonyms; use the distinction column to resolve near-matches.
| Term | Accepted explanation | Distinction |
|---|---|---|
| Tympanum | eardrum | Round membrane behind the eye; hears airborne sound |
| Nictitating membrane | third eyelid | Transparent fold that sweeps across the eye to keep it moist |
| Nares | nostrils | External openings for air; a frog also breathes through its skin |
| Cloaca | vent | Common opening for digestive, urinary, and reproductive tracts |
| Three-chambered heart | frog heart | Two atria and one ventricle |
| Lungs | paired lungs | Used with the skin for dual respiration; small and simple |
| Fat bodies | fat stores | Yellow, finger-like energy stores near the gonads |
| Gallbladder | bile sac | Small green sac tucked against the liver; stores bile |
| Comparative physiology | structure-function comparison across organisms | Requires function reasoning and evidence, not only memorized labels. |
| Collapsed organ | preservation or preparation artifact | May limit what a specimen can show about living function. |
| Tetrapod | four-limbed vertebrate branch | A frog comparison belongs on a tree, not a line. |
The split between Proficient and Mastery is the structure on the specimen, not the guess: a mastered student traces the gut from stomach to cloaca and names each organ. Ask “show me the three-chambered heart and tell me how it differs from ours.”
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Instrument handling & safe technique | Grips the scalpel, scissors, forceps, or probe awkwardly; cuts too hard or too deep; puts hands or specimen at risk. | Holds the instruments correctly with reminders and cuts more carefully, but still presses too hard or steadies the specimen poorly. | Holds each instrument the right way and makes shallow, controlled cuts, working safely for both the student and the specimen; this technique criterion requires educator observation. |
| Careful exposure & observation | Cuts before looking and slices through organs while opening the body cavity. | Makes the midline incision roughly and pins the body wall back unevenly, disturbing organs before observing them. | Makes a clean midline incision, pins back the body wall, and opens the cavity without damaging organs beneath; this exposure criterion requires observation. |
| Locating & naming external structures | Cannot point to the eyes, tympanum, nares, limbs, or cloaca, or tell fore from hind limb. | Finds a few external landmarks with prompting but confuses the tympanum or misses the nictitating membrane. | Locates and names eyes, nictitating membrane, tympanum, nares, limbs, webbing, and cloaca on the approved specimen, image, model, or virtual route. |
| Locating & naming internal organ systems | Guesses at the organs or names the wrong ones once the cavity is open. | Finds the larger organs but cannot reliably distinguish the small from the large intestine or locate the gallbladder and fat bodies. | Locates and names heart, lungs, liver, gallbladder, stomach, intestines, kidneys, and fat bodies on the approved route, recording collapsed or shifted organs as artifacts. |
| Explaining structure & function (and specimen care) | Cannot say what a structure does, and lets the specimen dry out or handles it carelessly. | Explains one or two organs' functions but not how the systems connect, and keeps the specimen moist only when reminded. | Explains the three-chambered heart, lungs, skin, double circulation, and preservation artifacts using the checked ratio; handling care is observed separately. |
| Integration (cross-domain) | Makes no supported connection between the source and the science. | Uses the source but needs help connecting evidence, writing, or limitations to the science. | Independently connects History, Reading, and Writing using a cited source, appropriate evidence, a limitation, and a scientific explanation. |
Read these before you grade. They show what Mastery and Developing actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Instrument handling & safe technique | Dev / Prof / Mast | |
| 2 | Careful exposure & observation | Dev / Prof / Mast | |
| 3 | Locating & naming external structures | Dev / Prof / Mast | |
| 4 | Locating & naming internal organ systems | Dev / Prof / Mast | |
| 5 | Explaining structure & function (and specimen care) | Dev / Prof / Mast | |
| 6 | Integration (cross-domain) | Dev / Prof / Mast |
☐ No ☐ Yes — for criterion: __________
Tokens left this term after this session (choose one): ☐ 3 ☐ 2 ☐ 1 ☐ None left
Each student has three tokens per term; each token retries one rubric criterion. Approved accommodations, equipment failures, and approved absences are handled separately and do not consume these tokens.
Dev = Developing · Prof = Proficient · Mast = Mastery · Unsure between two levels? Circle the lower one and note what a re-do would need.