Mississippi Science ZOO.1.1

ScienceGrades 9–12Zoology I and II

The Standard

Develop and use dichotomous keys to distinguish animals from protists, plants, and fungi.

2026 Mississippi College- and Career-Readiness Standards for Science · Evolution

Teacher's field guide

What Students Need to Do: Students build a key with paired choices about traits such as cell walls, food source, and cell number. They use it to identify organisms and explain each choice with evidence.
What Mastery Looks Like: A student can use their key to classify an earthworm, moss, mushroom, and amoeba. If an organism fits both choices or neither choice, they can fix the key.
Common Misconceptions: Students may think anything that moves is an animal, which leads them to misclassify an amoeba. They may also call yeast a protist because it has one cell.
How to Assess It: Give students two cards: sponge, many cells, no cell walls, eats food; mushroom, many cells, cell walls, absorbs food. Ask them to write one paired choice and use it to identify both.

Lesson moves

Give pairs trait cards for a sponge, oak seedling, mushroom, and amoeba; have them arrange paper strips into a branching key.
Ask students to explain in writing why a moving amoeba is not an animal but a stationary sponge is.
Have pairs swap keys, identify four mystery trait cards, and circle any choices that both fit the same card.
For a pond survey, give photo and trait cards for a paramecium and mosquito larva; have students classify both using their keys.

Free download

A ready-to-print activity worksheet aligned to ZOO.1.1, 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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