This packet is everything a parent or guide needs to assess Unit 08 at home — learning targets, the technique that counts as correct, the mastery rubric, calibration examples, and a clipboard score sheet. No multiple-choice test: the student shows mastery by observing a specimen and producing a labeled scientific drawing at the scope.
By the end of the Micrography unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Observe a specimen; produce a labeled drawing at the scope.
The student defends the magnification and scale bar (Page 4).
Drawing, magnification, and scale bar 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 draw what they see and derive the magnification and scale bar. 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 |
|---|---|---|
| Drawing conventions | ||
| Scientific drawing | biological drawing | Sharp pencil, no shading, clean single-line outlines |
| Leader line | label line | Ruled straight line from a label to the structure; don't let them cross |
| Title | drawing title | Names the specimen and view; required on every drawing |
| Draw what you see | observed record | Record the actual field, not the idealized textbook image |
| Scale & magnification | ||
| Total magnification | overall power | Eyepiece power × objective power (e.g. 10× × 40× = 400×) |
| Objective & eyepiece | the two lens powers | Their powers multiply — don't report one alone |
| Field of view | field diameter | The circle you see; measure it to derive the scale bar |
| Scale bar | scale line | A labeled line showing real size; derived from the field of view |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Drawing conventions | Sketches loosely with a dull pencil, shading, and no title or labels. | Uses labels but shades the drawing, crosses leader lines, or leaves off the title. | Draws with a sharp pencil, clean unshaded outlines, ruled leader lines to each label, and a clear title. |
| Drawing what you see | Draws the textbook picture instead of the specimen in the eyepiece. | Draws from the scope but “corrects” it toward what was expected. | Records exactly what is in the field — including the unexpected — rather than an idealized version. |
| Proportion & placement | Draws structures at wildly wrong relative sizes or positions. | Gets the overall shape but misjudges the size of one part against another. | Renders each structure in correct proportion and position relative to the others in the field. |
| Stating total magnification | Leaves off the magnification or guesses at it. | Records a magnification but from the wrong objective or without the eyepiece. | States the total magnification by multiplying the eyepiece and objective powers used for the drawing. |
| Adding a scale bar | Adds no scale bar, or draws one with no basis. | Draws a scale bar but cannot show how its length was derived. | Measures the field of view and adds a correctly sized, labeled scale bar to the drawing. |
| 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 the field, not the book: a mastered drawing shows the actual specimen, including the unexpected. Ask “show me the fold you drew — is it really in the eyepiece?”
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 | Drawing conventions | NY / Appr / Mast | |
| 2 | Drawing what you see | NY / Appr / Mast | |
| 3 | Proportion & placement | NY / Appr / Mast | |
| 4 | Stating total magnification | NY / Appr / Mast | |
| 5 | Adding a scale bar | 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.