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 05 learning pathway.
The student demonstrates the following:
Five science criteria plus separately reported integration (Page 3).
Mount onion and elodea; locate each structure on the scope.
The student names each structure 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. A criterion counts as mastered only when the student can both prepare the mount and name what they see without guessing. 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 |
|---|---|---|
| Field of view | One observed microscope field | A field is not an independent plant or species sample. |
| Cell density | Count per area | Requires calibrated field area and units. |
| Tissue region | Group of cells with related structure/function | Do not identify a whole tissue from one ambiguous field alone. |
| Chloroplast-rich fraction | Percent of visible cells showing chloroplasts | Depends on tissue, focus and preparation. |
The split is image, not guess: Mastery brings the structure into sharp focus and names it on sight. Ask, “show me the nucleus.”
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Preparing plant wet mounts | Floods the slide or traps bubbles under the coverslip so nothing is clearly in view. | Mounts onion or elodea but tears the epidermis or drops the coverslip so air bubbles crowd the field. | Peels a thin onion epidermis or an elodea leaf, adds iodine or water, and lowers the coverslip to give a clean, bubble-free wet mount. |
| Locating cell structures | Cannot point to the cell wall, nucleus, or vacuole, or expects chloroplasts in onion where there are none. | Finds the cell wall but hunts for the nucleus, or misses that elodea's green bodies are chloroplasts. | Locates cell wall, nucleus, and vacuole in onion and adds chloroplasts and cytoplasmic streaming in elodea — naming each on sight. |
| Finding guard cells & stomata | Does not know what a stoma looks like and scans past the guard cells. | Finds a stoma when shown one but cannot relocate the pattern on a fresh field. | Locates paired guard cells and the stomatal pore on a leaf peel and explains what the opening does. |
| Distinguishing tissue regions | Treats the whole mount as one uniform sheet of identical cells. | Notices cells differ but cannot say which region is which. | Names which tissue region is which (e.g., epidermis vs. the cells beneath) and distinguishes real region differences from field choice or artifacts, using area-based counts when appropriate. |
| Resolving structure at the scope | Settles for a blurry blob and guesses at what it “should” be. | Gets a partial focus but cannot bring a whole structure into crisp view. | Focuses/adjusts diaphragm until walls or organelles resolve (observed), then names resolved vs. model-based structures. |
| 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 | Preparing plant wet mounts | Dev / Prof / Mast | |
| 2 | Locating cell structures | Dev / Prof / Mast | |
| 3 | Finding guard cells & stomata | Dev / Prof / Mast | |
| 4 | Distinguishing tissue regions | Dev / Prof / Mast | |
| 5 | Resolving structure at the scope | 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
Dev = Developing · Prof = Proficient · Mast = Mastery · Unsure between two levels? Circle the lower one and note what a re-do would need.