Lesson Plan

• Describe the process of transpiration and its role in water movement within plants.
• Explain how stomatal opening, temperature, wind, humidity, and light intensity influence transpiration rate.
• Identify why transpiration is important for nutrient transport, cooling, and turgor maintenance.
• Interpret a leaf cross‑section diagram to locate stomata and the water‑movement pathway.
• Predict how changes in environmental conditions will affect the rate of transpiration.

• Projector or interactive whiteboard
• PowerPoint slides with a leaf diagram
• Printed worksheet with quick‑check question
• Real leaf specimens for observation
• Ruler and markers for labeling diagrams
• Exit‑ticket cards

Begin with the question, “What does a plant ‘sweat’ and why?” Connect this to students’ prior knowledge of plant leaves and water. State that today they will learn how transpiration moves water and how to recognise its effects. Explain that success will be shown by correctly describing the process and interpreting a diagram.

1. Do‑now (5'): Students answer the quick‑check question on a sticky note.
2. Mini‑lecture (10'): Define transpiration, show the leaf diagram, and discuss its role in the water column.
3. Diagram activity (10'): In pairs, label a printed leaf cross‑section, highlighting stomata and water pathways.
4. Factors investigation (15'): Small‑group stations explore how temperature, wind, humidity, and light affect transpiration using simple simulations or data tables.
5. Guided practice (10'): Complete worksheet questions linking factors to rate changes.
6. Recap quiz (5'): Whole‑class rapid‑fire questions to check understanding.

Summarise that transpiration drives water upward, cools the plant, and maintains turgor, while environmental factors modulate its rate. Students write one exit‑ticket answer predicting how a drought would alter transpiration. For homework, assign a short research task on how plants adapt their stomatal behaviour in arid environments.