Mississippi Science ZOO.3.3

ScienceGrades 9–12Zoology I and II

The Standard

ZOO.3: Students will understand the structure and function of phylum Mollusca, and how they adapt to their environments.

Explain how the mantle is used in forming the shell.

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

Teacher's field guide

What Students Need to Do: Students explain that the mantle is living tissue that makes shell material. They show how the mantle deposits calcium carbonate and protein in layers as the shell grows.
What Mastery Looks Like: A student can label the mantle just inside a clam shell and point to where it adds new shell material. They can explain why a growing shell has new material along its edge.
Common Misconceptions: Students may think the shell is mantle tissue that hardened, or that the shell stretches as the animal grows. Some confuse the mantle with the foot, which helps the animal move.
How to Assess It: Draw a clam shell with its mantle. Label both, mark where new shell material is added, and write one sentence explaining what makes that material.

Lesson moves

Cut a paper shell, place tissue beneath it as the mantle, and add paper strips along the rim to model shell growth.
Show a clam shell with growth rings and ask, "How could the mantle have made the shell larger?"
Give pairs cards labeled mantle, calcium carbonate, protein, and shell layer; have them arrange the cards to show how a shell forms.
Present two oyster-farm tanks, one at pH 8.1 and one at pH 7.7, and ask which might make shell building harder.

Free download

A ready-to-print activity worksheet aligned to ZOO.3.3, with an answer key for the teacher on its own page. No account needed.

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

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