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 worked answers: Unit 02 learning pathway.
The student demonstrates the following:
Five science criteria plus separately reported integration (Page 3).
Section roots, stems, and leaves and read them under the scope.
The student reasons from the cross-section under the scope aloud (Page 4).
Sketches, section labels, and vascular arrangements 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 make the section and justify the plant biology behind it. 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.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| Root & shoot systems | ||
| Root system | roots | Anchors and absorbs water & minerals; not where photosynthesis happens |
| Shoot system | stems & leaves | Lifts leaves to the light; supports and photosynthesizes |
| Apical meristem | tip meristem | Drives primary growth (length) at root and shoot tips |
| Vascular cambium | lateral meristem | Drives secondary growth (girth); makes wood |
| Leaf anatomy | ||
| Epidermis | leaf surface | Covers the leaf; bears the stomata and guard cells |
| Palisade mesophyll | palisade layer | Tall cells near the top, packed with chloroplasts for light |
| Spongy mesophyll | spongy layer | Loose cells with air spaces for gas exchange |
| Stoma (stomata) | leaf pore | Lets CO₂ in / water vapor out; guard cells control it |
| Vascular tissue | ||
| Xylem | water tissue | Carries water & minerals up; toward the inside of a stem |
| Phloem | sugar tissue | Carries sugar from source to sink; toward the outside of a stem |
| Vascular bundle | vein | Xylem + phloem together; arranged differently in roots vs stems |
| Cortex | ground tissue | Fills between epidermis and vascular tissue; storage & support |
The split between Proficient and Mastery is structure doing a job: not just labeling a layer, but saying what it does and why it sits where it does. Ask “so what is that layer for?”
| Criterion | Developing | Proficient | Mastery |
|---|---|---|---|
| Root & shoot systems | Cannot say what roots and shoots each do for the plant. | Names the two systems but confuses their organs or jobs. | Distinguishes the root and shoot systems, names the organs of each, and explains how anchorage, absorption, support, and light capture divide between them. |
| Primary vs. secondary growth | Thinks all growth is just getting taller. | Defines primary growth but cannot explain what makes a stem woody. | Separates primary growth at the apical meristems from secondary growth at the vascular cambium, and explains how the cambium adds girth and wood. |
| Leaf anatomy | Cannot connect a leaf feature to its function. | Names tissues but misuses the measurement or arrangement model. | Identifies epidermis, mesophyll, stomata, and veins; explains their functions and interprets assigned leaf-area or arrangement measurements. |
| Xylem & phloem organization | Cannot tell xylem from phloem or say what each carries. | Knows xylem carries water and phloem carries sugar but not how they are arranged. | Locates xylem and phloem in a stem and a root, explains the different arrangements, and relates modified organs like bulbs or tubers back to their tissues. |
| Lab technique (dissection & microscopy of plant sections) | Cannot cut a clean section or bring it into focus. | Makes a section but misidentifies mesophyll, cambium, or the vascular bundles. | Cuts a thin stem, root, or leaf section, focuses it under the scope, and correctly identifies the tissue layers and vascular arrangement. |
| 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 | Root & shoot systems | Dev / Prof / Mast | |
| 2 | Primary vs. secondary growth | Dev / Prof / Mast | |
| 3 | Leaf anatomy | Dev / Prof / Mast | |
| 4 | Xylem & phloem organization | Dev / Prof / Mast | |
| 5 | Lab technique (dissection & microscopy of plant sections) | 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.