Mississippi Science ZOO.6.1

ScienceGrades 9–12Zoology I and II

The Standard

ZOO.6: Students will understand the structure and function of phylum Echinodermata, and how they demonstrate the characteristics of living things.

Recognize that the echinoderms have spines on their skin that are extensions of plates that form from the endoskeleton.

2026 Mississippi College- and Career-Readiness Standards for Science · Phylum Echinodermata

Teacher's field guide

What Students Need to Do: Students identify spines on sea urchins and sea stars and trace them to hard plates beneath the skin. They explain that the plates form an internal skeleton.
What Mastery Looks Like: Given a sea urchin cross-section, a student can label the skin, a spine, and the plate it extends from. They can explain why the plate is part of an internal skeleton.
Common Misconceptions: Students may think the spines are separate parts stuck onto the skin. They may call the plates an outer shell because the spines are visible.
How to Assess It: Ask students to sketch a sea urchin spine and the plate beneath it. Have them label the skin, plate, and spine, then explain their connection in one sentence.

Lesson moves

Shape clay plates with raised clay spines, then drape plastic wrap over both to model skin covering an internal skeleton.
Ask: “Why is a sea urchin’s skeleton internal if its spines are visible?” Have students answer with a labeled sketch.
Play label-and-check with a hand-drawn sea urchin cross-section; partners take turns marking skin, plate, and spine.
Show a beach photo of an empty sea urchin skeleton; have students mark the bumps where spines attached to its plates.

Free download

A ready-to-print activity worksheet aligned to ZOO.6.1, with an answer key for the teacher on its own page. No account needed.

PDF, US Letter, prints cleanly in black and white.

Keep exploring

Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.