This packet is everything a parent or guide needs to assess Unit 02 at home — learning targets, the answers that count as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery at the microscope, finding cell parts and explaining what each one does.
By the end of the Cells & Their Structures unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Make slides of onion-skin, cheek, and pond-water cells.
The student explains what each cell part does (Page 4).
Labeled cell sketches, observations, and part names kept distinct.
You are making a decision, not adding up points. For each criterion, decide whether the work is Not yet, Approaching, or Mastered — the column language tells you which. A criterion counts as mastered only when the student can both find the cells under the lens and explain the biology behind them. A student carries three tokens per term; one token buys a re-do of one criterion on another day, so a single bad afternoon never sinks the unit.
Accept any answer in the synonyms column — they are pre-approved as equivalent. The third column flags the confusions that look close but are not yet, so you can coach precisely.
| Canonical answer | Accepted synonyms | Common confusion / discriminator |
|---|---|---|
| The cell & cell theory | ||
| Cell | building block of life | The smallest unit of life; all living things are made of them |
| Cell theory | all living things are cells | New cells come from other cells — they don’t just appear |
| Cell membrane | outer boundary | Controls what goes in and out; both plant and animal cells have one |
| Nucleus | control center | Holds the instructions (DNA); not the whole cell |
| Cell parts & their jobs | ||
| Cytoplasm | jelly inside the cell | Where the parts float and work; not empty space |
| Mitochondria | powerhouse | Where the cell gets its energy; one is a mitochondrion |
| Chloroplast | green food-maker | Makes food from sunlight; found in plant cells, not animal cells |
| Cell wall | stiff outer layer | Extra support outside the membrane; plant cells only |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Cells & cell theory | Thinks only some living things, like animals, are made of cells. | Says living things are made of cells but can’t explain the cell theory. | Explains that all living things are made of cells and states the cell theory in their own words. |
| Plant vs. animal cells | Can’t tell a plant cell from an animal cell. | Names a difference or two but mixes up which cell has what. | Compares plant and animal cells and explains why plant cells have a cell wall and chloroplasts. |
| Cell parts & their jobs | Can name one or two parts but not what they do. | Lists the parts but matches only some to their jobs. | Names the main parts — cell membrane, nucleus, cytoplasm, mitochondria, and more — and explains the job of each. |
| Cells as living systems | Thinks a cell is just a blob with no working parts. | Knows cells are busy but can’t connect a part to a life process. | Explains how the parts work together so the cell can get energy, grow, and stay alive. |
| Lab technique (using a microscope) | Can’t focus the microscope or makes a messy slide. | Gets an image but struggles to focus clearly or center the sample. | Makes a clean slide of onion-skin, cheek, or pond-water cells, focuses on both powers, and sketches what they see with labels. |
| 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. |
The split between Approaching and Mastered is naming vs. explaining: not just labeling the nucleus, but saying what it does. Ask “so what is that part for?”
Read these before you grade. They show what Mastered and Not yet actually sound like, plus the edge cases where you should coach rather than decide on the spot.
Student: ______________________________________ Date: _______________ Guide: _________________________
| # | Criterion | Decision | Notes |
|---|---|---|---|
| 1 | Cells & cell theory | NY / Appr / Mast | |
| 2 | Plant vs. animal cells | NY / Appr / Mast | |
| 3 | Cell parts & their jobs | NY / Appr / Mast | |
| 4 | Cells as living systems | NY / Appr / Mast | |
| 5 | Lab technique (using a microscope) | NY / Appr / Mast | |
| 6 | Integration (cross-domain) | NY / Appr / Mast |
☐ No ☐ Yes — for criterion: __________ Tokens remaining: ☐ 3 ☐ 2 ☐ 1 ☐ 0
NY = Not yet · Appr = Approaching · Mast = Mastered · Unsure between two levels? Circle the lower one and note what a re-do would need.