Plants | Substitute Teacher
Students explore the physics behind plant processes such as light absorption, water transport, and movement responses. This substitute-friendly lesson uses simple observations, discussion, and quick practice to connect physics concepts to plant life in an accessible way.
| Term | Definition |
|---|---|
| Photosynthesis | The process plants use to convert light energy into chemical energy. |
| Energy transfer | The movement of energy from one form or object to another. |
| Capillary action | The movement of water through narrow spaces without outside help from pumps. |
| Xylem | Plant tissue that carries water and minerals upward from the roots. |
| Force | A push or pull that can change the motion of an object. |
| Pressure | The amount of force applied over an area. |
Display a picture of a plant in sunlight and ask: 'What physics ideas might help a plant survive?' Write 2-3 student responses on the board.
Individually write one or two ideas, then share with a partner.
Explain three key connections: 1) sunlight provides energy for photosynthesis, 2) water moves upward through xylem with help from capillary action and pressure differences, and 3) plants respond to light and gravity through motion over time. Use simple diagrams or images.
Listen, take notes, and ask clarifying questions.
Show 2-3 examples or images: a bending plant toward light, a celery stalk in colored water, and a tall tree moving water upward. Ask students to identify the physics concept involved in each example.
Work with a partner to match each example to the correct concept and explain their choice.
Hand out a short response sheet with three prompts: 'How does light help plants?', 'How does water move in a plant?', and 'What physics idea explains plant movement toward light?' Circulate and support as needed.
Write brief answers using vocabulary from the lesson.
Ask students to complete an exit ticket: one sentence explaining one physics idea in plants and one question they still have. Collect as they leave.
Submit exit tickets and share one takeaway if time allows.
Review the three main ideas: plants capture light energy, move water using physical processes, and respond to environmental forces over time. Ask students to name one physics concept they can now connect to plant life.
Formative assessment is based on participation in discussion, accuracy in guided practice, written responses on the independent practice sheet, and the exit ticket.