This packet is everything a parent or guide needs to assess Unit 07 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 by keying an unknown specimen out to a name and defending each couplet choice.
By the end of the Plant Diversity & Classification unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Key an unknown specimen out to a name.
The student defends each couplet choice aloud (Page 4).
Group placement, couplet path, and final name 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 work the key and defend the plant biology behind it. 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 |
|---|---|---|
| Groups & classification | ||
| Bryophyte | moss / liverwort | Non-vascular; no true roots or seeds — the simplest land plants |
| Angiosperm | flowering plant | Seeds enclosed in a fruit; the most diverse group — not a gymnosperm |
| Monocot vs dicot | one vs two seed leaves | Parallel vs net veins; flower parts in 3s vs 4s/5s |
| Binomial nomenclature | two-part Latin name | Genus (capitalized) + species, both italicized |
| Naming & keys | ||
| Taxonomy | classification | Ranks from domain down to species; a hierarchy, not a random list |
| Phylogeny | evolutionary tree | Groups plants by shared ancestry, not by looks alone |
| Cladistics | shared-derived-trait method | Reads a cladogram from shared innovations |
| Dichotomous key | paired-choice key | Each couplet offers two choices; follow them to a name |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Major plant groups | Cannot name the major plant groups. | Lists a few groups but cannot order them or state their traits. | Orders bryophytes, seedless vascular plants, gymnosperms, and angiosperms and names the key innovation of each — vascular tissue, seeds, and flowers. |
| Monocots vs. dicots | Cannot tell a monocot from a dicot. | Names one difference but applies it inconsistently. | Distinguishes monocots and dicots by leaf venation, flower parts, and root type in real specimens. |
| Taxonomy & binomial nomenclature | Cannot explain why a plant has a two-part scientific name. | Reads a binomial name but muddles genus, species, or the ranks. | Explains binomial nomenclature, writes a name correctly, and places a plant in the taxonomic hierarchy. |
| Phylogeny & cladistics | Treats classification as a random list. | Reads a simple tree but cannot infer relationships from it. | Uses shared derived traits to read a cladogram and explains how phylogeny reflects common ancestry. |
| Lab technique (dichotomous key) | Cannot follow a key’s paired choices. | Works a key but takes wrong branches or ignores the specimen’s traits. | Uses a dichotomous key to identify an unknown plant, justifying each couplet choice from the specimen in hand. |
| 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 justifying the couplet: it is not enough to reach a name — the student defends each branch from a trait on the specimen. Ask “why did you take that branch and not the other?”
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 | Major plant groups | NY / Appr / Mast | |
| 2 | Monocots vs. dicots | NY / Appr / Mast | |
| 3 | Taxonomy & binomial nomenclature | NY / Appr / Mast | |
| 4 | Phylogeny & cladistics | NY / Appr / Mast | |
| 5 | Lab technique (dichotomous key) | 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.