Mississippi Science ZOO.4.7
The Standard
- ZOO.4
- Students will describe the evolution of structure and function of phylum Platyhelminthes, phylum Nematoda, and phylum Annelida.
Enrichment: Design, conduct, and communicate results of an experiment demonstrating the importance of flatworms, roundworms, and annelids for human use (e.g., the earthworm in agriculture and the leech in medicine).
2026 Mississippi College- and Career-Readiness Standards for Science · Phyla Platyhelminthes, Nematoda, and Annelida
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students plan a fair test of how earthworms affect soil drainage. They collect and graph results, then explain how different worms can help farmers, researchers, and doctors.
What Mastery Looks Like
- Students keep the soil amount, water volume, and measurement time the same in cups with and without earthworms. They use their measurements to make a claim about drainage and name one limit of the test. They can explain how planaria help research, beneficial nematodes control crop pests, and leeches help after surgery.
Common Misconceptions
- Students may think all flatworms and roundworms are parasites, or that leeches clean infected blood. They may credit earthworms for a drainage difference when the cups contain different amounts of soil or water.
How to Assess It
- After the cup test, ask students to submit a two-bar graph and answer: “What did earthworms change, and what else might explain the difference?”
Lesson moves
Ways to Teach It
Have groups choose a water volume, set up matched perforated soil cups with and without earthworms, then measure and graph drainage after three days.
Give students two fact cards, one about planaria regrowing tissue and one about nematodes killing crop pests; ask how each could help people.
Have teams sort cards for planaria, pest-killing nematodes, earthworms, and leeches by worm group and human use.
Present a reattached-finger case with poor blood drainage; ask why a surgeon might use medicinal leeches while new veins grow.
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- ZOO.4.8
Enrichment: Use an engineering design process to design and construct a system to utilize flatworms, roundworms, or annelids to meet a human need. *
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