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 by observing live specimens and reasoning from body plan aloud.
By the end of the Sponges, Cnidarians & Worms unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Observe hydra and planaria under magnification, then describe body plan.
The student explains the body plan behind what they see (Page 4).
Observations, sketches, and responses 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 handle the microscope and justify the animal 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 |
|---|---|---|
| Sponges & cnidarians | ||
| Sponge | poriferan; filter feeder | An animal with no true tissues; not a plant |
| Nematocyst | stinging cell / capsule | Fires a thread to capture prey; unique to cnidarians |
| Radial symmetry | body parts around a center | No head end; a hydra, jellyfish, or anemone |
| Cnidarian | hydra / jellyfish / anemone / coral | United by radial symmetry and nematocysts |
| Body forms & worms | ||
| Polyp | anchored, tube-shaped form | The attached stage — a hydra or coral polyp |
| Medusa | free-swimming, bell-shaped form | The drifting stage — a jellyfish |
| Bilateral symmetry | mirror-image left and right halves | Comes with a head end and a front and back |
| Cephalization | senses gathered at a head end | The worm’s leap; lets it move toward food, not drift into it |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Sponges & filter feeding | Thinks a sponge is a plant or names no defining trait. | Calls a sponge an animal but cannot say how it feeds or that it lacks true tissues. | Explains that a sponge is an animal with no true tissues that filters food from water pulled through its pores. |
| Cnidarians, symmetry & nematocysts | Cannot name a trait that unites hydra, jellyfish, and anemones. | Groups cnidarians together but misses radial symmetry or the stinging cells. | Identifies cnidarians by radial symmetry and nematocysts and explains how the stinging cells capture prey. |
| Polyp & medusa forms | Treats every cnidarian as one fixed shape. | Names polyp and medusa but cannot say which animals show which. | Distinguishes the anchored polyp from the free-swimming medusa and gives an example of each. |
| Worms, bilateral symmetry & cephalization | Calls all worms the same and describes no body plan. | Knows worms are bilateral but overlooks a head end or a nervous system. | Explains bilateral symmetry, cephalization, and the first true nervous systems, and tells flat, round, and segmented worms apart. |
| Lab technique (hydra & planaria observation) | Skips the microscope or records nothing about behavior. | Observes the specimen but misreads its symmetry or response. | Observes live hydra and planaria under magnification, sketches each, and records how it feeds or responds to a stimulus. |
| 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 body plan explains behavior: not just naming radial or bilateral, but using it to say why a hydra drifts food into its tentacles while a planarian moves toward food with a real head end. Ask “so what does that body plan let it do?”
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 | Sponges & filter feeding | NY / Appr / Mast | |
| 2 | Cnidarians, symmetry & nematocysts | NY / Appr / Mast | |
| 3 | Polyp & medusa forms | NY / Appr / Mast | |
| 4 | Worms, bilateral symmetry & cephalization | NY / Appr / Mast | |
| 5 | Lab technique (hydra & planaria observation) | 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.