This packet is everything a parent or guide needs to assess Unit 03 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 pressing, keying out, and classifying seaweed, then defending each identification aloud.
By the end of the Marine Plants, Algae & Kelp Forests unit, a student should be able to:
Six criteria, each judged Not yet / Approaching / Mastered (Page 3).
Press, key out, and classify specimens — done at the bench.
The student defends each identification aloud (Page 4).
Pressed specimens, key steps, and classifications 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 key the specimen and justify the group it belongs to. 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 |
|---|---|---|
| Algae vs true plants | ||
| Algae | seaweed; protist | Not a true plant; no true roots, stems, or leaves |
| Seagrass | marine flowering plant | A true plant that flowered and returned to the sea |
| Holdfast | anchoring base | Grips rock; anchors an alga but does not absorb like a root |
| Structure, kelp & carbon | ||
| Stipe | stalk | The stem-like part, between holdfast and blade — not a true stem |
| Blade | frond; lamina | The leaf-like part where most photosynthesis happens |
| Kelp forest | kelp bed | A tall brown-algae habitat; shelter and nursery for whole communities |
| Seagrass meadow | seagrass bed | Rooted flowering-plant habitat; nursery and major carbon store |
| Algal groups | green / brown / red algae | Sorted by pigment and features, not by “leaf” shape |
| Criterion | Not yet | Approaching | Mastered |
|---|---|---|---|
| Algae vs true marine plants | Calls everything attached to rock a “plant.” | Knows seaweed and seagrass differ but cannot say how. | Explains that seaweeds are algae (protists) while seagrasses are true flowering plants, and uses the right group for each specimen. |
| Algal structure & groups | Labels seaweed with “roots, stems, and leaves.” | Uses holdfast, stipe, and blade but cannot tell the algal groups apart. | Names the holdfast, stipe, and blade correctly and sorts specimens into green, brown, and red algae. |
| Kelp forests & seagrass meadows | Thinks seaweed is just clutter in the water. | Knows kelp is large but not that it builds a habitat. | Explains kelp forests and seagrass meadows as three-dimensional habitats — shelter, nursery, and food. |
| Photosynthesis, carbon & productivity | Does not connect algae to oxygen or carbon. | Knows algae photosynthesize but not at what scale. | Relates algal and seagrass photosynthesis to oxygen production, carbon storage, and high productivity. |
| Lab technique (algae & seaweed survey) | Collects specimens without pressing, keying, or labeling them. | Presses seaweed but keys it out inconsistently. | Runs a clean seaweed survey — presses, keys out, and classifies into the correct algal group. |
| 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 why it’s in that group: not just naming the parts, but explaining what makes it a green, brown, or red alga — or a true plant. Ask “why isn’t this a plant?”
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 | Algae vs true marine plants | NY / Appr / Mast | |
| 2 | Algal structure & groups | NY / Appr / Mast | |
| 3 | Kelp forests & seagrass meadows | NY / Appr / Mast | |
| 4 | Photosynthesis, carbon & productivity | NY / Appr / Mast | |
| 5 | Lab technique (algae & seaweed survey) | 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.