Mississippi Science ZOO.7.5
The Standard
- ZOO.7
- Students will understand the structure and function of phylum Chordata, classes Chondrichthyes and Osteichthyes, and how they demonstrate the characteristics of living things.
Label and describe functions of the anatomical features of bony fish, including internal organs, lateral line system, operculum, swim bladder, and external fins.
2026 Mississippi College- and Career-Readiness Standards for Science · Phylum Chordata, Classes Chondrichthyes and Osteichthyes
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students label internal organs, the lateral line, operculum, swim bladder, and major fins on a bony fish diagram. They explain how these parts help the fish breathe, digest food, sense movement, control depth, and swim.
What Mastery Looks Like
- A student can label the gills, heart, stomach, intestines, swim bladder, lateral line, operculum, and five major fins on an unmarked diagram. They can explain, for example, that the lateral line detects water movement and the caudal fin provides propulsion.
Common Misconceptions
- Students may think the lateral line is just a stripe. They may confuse the operculum with the gills or think the swim bladder supplies oxygen. Some assume every fin pushes the fish forward.
How to Assess It
- Give students a numbered fish diagram. Ask them to name the gills, stomach, lateral line, operculum, swim bladder, and five fins, then write the jobs of the lateral line and swim bladder.
Lesson moves
Ways to Teach It
Give pairs a paper fish cutout and labeled organ cards; have them place each card and explain its job.
Ask students to write what would change if a fish lost its caudal fin or its operculum.
Play a label relay with blank fish diagrams and fin cards; teams place each fin and name its job.
Play a short aquarium video; students track gill-cover movement and identify which fins help the fish turn and stay level.
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Related Standards
- ZOO.7
Students will understand the structure and function of phylum Chordata, classes Chondrichthyes and Osteichthyes, and how they demonstrate the characteristics of...
- L.2.1.2
Classify vertebrates (mammals, fish, birds, amphibians, and reptiles) based on their physical characteristics.
- ZOO.7.3
Identify specific fish species and characteristics that differentiate class Chondrichthyes (e.g., sharks, skates, and rays).
- MAQ.7.5
Dissect representative taxa (e.g., shark, fish); collect data; compare their internal and external anatomy; and analyze, explain, and communicate results.
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