Texas TEKS 7.5.D

Science7th GradeRecurring themes and concepts

The Standard

examine and model the parts of a system and their interdependence in the function of the system

Texas Essential Knowledge and Skills for Science

Teacher's field guide

What Students Need to Do: Students identify the parts of a system and explain each part's job. They create models showing how parts interact and predict what happens when one part changes or fails.
What Mastery Looks Like: Students can label system components, trace interactions, and explain how the parts work together. They can use evidence from a model to predict the effects of removing a component.
Common Misconceptions: Students may treat a system as a list of parts rather than a set of interactions. They may assume every part is equally necessary or that changing one part affects only that part.
How to Assess It: Show a labeled flashlight diagram and ask: How do three parts work together, and what happens if the switch is removed?

Lesson moves

Build a simple circuit with a battery, wires, bulb, and switch, then remove each part and record the effect.
Write about one school cafeteria component and predict how its failure would affect workers, students, supplies, and cleanup.
Play a system card match, pairing component cards with function, interaction, and failure effect cards.
Diagram a bicycle braking system from a photo and explain how the lever, cable, pads, and wheel interact.

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