Unit 01 · Plant Cells & Tissues
This unit builds from the plant cell outward: the organelles every cell shares, the three features that set plant cells apart — the cellulose cell wall, the large central vacuole, and the plastids — and how specialized cells group into the dermal, ground, and vascular tissue systems that meristems generate. Mastery means you can read a section of plant tissue under the scope as living structure with a job, not a labeled diagram to memorize.
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Plant cell structure & organelles | Confuses organelles or cannot tell a plant cell from an animal cell. | Names organelles but stumbles on which features are unique to plant cells. | Identifies every major organelle under the scope, states its function, and explains what plant and animal cells share. |
| Cell wall & central vacuole | Thinks the cell wall and cell membrane are the same thing. | Defines the cell wall but cannot explain turgor or the vacuole's role. | Explains how the cellulose wall and a turgid central vacuole give a plant cell its shape and support, and predicts what happens when the cell loses water. |
| Plastids & chloroplasts | Thinks every plant cell is green and full of chloroplasts. | Names chloroplasts but not other plastids or where each is found. | Distinguishes chloroplasts, chromoplasts, and amyloplasts, and explains why root and storage cells have no chloroplasts. |
| Tissue systems & meristems | Cannot name the plant tissue systems. | Lists dermal, ground, and vascular tissue but cannot place them in a real section. | Locates dermal, ground, and vascular tissue in a stem or leaf section and explains how meristems generate each. |
| Lab technique (microscopy of plant tissue) | Skips staining or cannot bring a prepared slide into focus. | Focuses the scope but misidentifies stomata, xylem, or epidermis. | Prepares an epidermal peel, focuses cleanly at each magnification, and identifies stomata, guard cells, and xylem in the field of view. |
| Integration (cross-domain) | Treats the science as isolated facts; makes no cross-domain connection. | Names a link to history, reading, or writing but cannot defend why it matters. | Connects the unit to its anchor across History · Reading · Writing (plus chosen electives) and defends why the connection matters. |
“A plant cell has a cellulose wall and a big central vacuole an animal cell doesn’t — when the vacuole is full of water the cell is turgid and holds the leaf firm; when it dries out the plant wilts. The green is chloroplasts, but the root cells I looked at had none, because they aren’t doing photosynthesis.”
“It’s got a wall… and it’s green because plants are green? I found the cells but I’m not sure which part is which.”
You demonstrate this unit through microscopy labs — epidermal peels and prepared cross-sections — plus short oral checks where you reason from what you see aloud, not a multiple-choice test. A criterion counts as mastered only when you can both run the technique and justify the plant biology behind it. Mastery is demonstrated, not awarded.
A 5-page clipboard packet — unit overview, key terms, the mastery rubric, anchor examples, and a score sheet you can print and grade against.