Texas TEKS 4.5.D

Science4th 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 break a system into its main parts and explain each part’s job. They use a diagram or physical model to show how the parts work together.
What Mastery Looks Like: Students can label the parts of a familiar system and trace how an action in one part affects another. They can predict what happens when a part is removed, blocked, or changed.
Common Misconceptions: Students may list parts without explaining how the parts interact. They may think one part works alone or that removing a small part will not affect the whole system.
How to Assess It: Give students a diagram of a simple circuit. Ask them to label each part and explain what happens if the battery is removed.

Lesson moves

Build a working flashlight model with a battery, bulb, wires, and switch, then remove one part and record what changes.
Ask students to explain in writing how roots, stems, and leaves work together to keep a plant alive.
Play a system match game where students pair part cards with job cards, then connect parts that depend on each other.
Examine a bicycle and trace how pushing a pedal causes the wheels to move, naming each part involved.

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A ready-to-print activity worksheet aligned to 4.5.D, with an answer key for the teacher on its own page. No account needed.

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