Mississippi Science MAQ.7.3

ScienceGrades 9–12Marine and Aquatic Science I & II

The Standard

Utilize a dichotomous key to identify select aquatic vertebrates.

2026 Mississippi College- and Career-Readiness Standards for Science · Vertebrate Consumers

Teacher's field guide

What Students Need to Do: Students use a series of paired choices to identify an aquatic vertebrate. They check visible body traits at each step and follow the key to a name.
What Mastery Looks Like: A student can identify an unfamiliar animal from a clear photo without guessing from memory. They can show the choices they made and point to the traits that support them.
Common Misconceptions: Students may jump to a familiar name instead of following every choice. They may confuse a ray with a flatfish because both look flat, or miss the difference between a shark’s vertical tail and a dolphin’s horizontal flukes.
How to Assess It: Hand out an unlabeled photo of a stingray and the class key. Ask students to write their final identification, each choice they made, and two traits visible in the photo.

Lesson moves

Give pairs photo cards of sharks, rays, turtles, and dolphins, then have them mark each choice on a printed key.
Show a shark and a dolphin photo, then ask students to write which visible trait separates them in the key.
Play a partner round: one student follows the key for an unlabeled photo while the other checks each choice against the image.
Use an unlabeled wildlife rescue photo and have students record its identification and supporting traits on a mock intake form.

Free download

A ready-to-print activity worksheet aligned to MAQ.7.3, 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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