Chapter 4 — Photosynthesis
Teacher Activity
Play a 2-minute time-lapse video of a plant bending toward sunlight. Ask the class: "Where does a plant get its energy to grow?"
Student Activity
Watch the video. Discuss with a partner and share initial ideas with the class. Write one prediction in their science journal.
Teacher Activity
Guide students through a leaf chromatography activity. Provide step-by-step instructions. Circulate and ask probing questions: "What do the different colour bands tell you?"
Student Activity
Perform chromatography using leaves and alcohol. Record observations in their science journal: colours seen, position of bands, and inferences.
Teacher Activity
Introduce the photosynthesis equation: 6CO₂ + 6H₂O + light → C₆H₁₂O₆ + 6O₂. Explain the role of chlorophyll in absorbing light energy. Connect to the chromatography results.
Student Activity
Take structured notes. Ask clarifying questions. Connect the green pigment from the chromatography to chlorophyll's function.
Teacher Activity
Present two scenarios on the board: (A) a plant kept in a dark cupboard for a week, (B) a plant in full sunlight. Ask groups to predict and explain what happens to each plant.
Student Activity
In groups of 3, create a compare-and-contrast poster for the two scenarios using the photosynthesis equation to justify predictions.
Teacher Activity
Distribute the exit ticket. Circulate to observe without correcting. Collect responses before dismissal.
Student Activity
Complete exit ticket: draw and label the photosynthesis equation showing all inputs and outputs. No notes allowed.
Assessment Methods
Exit ticket: Students draw and label the photosynthesis equation (inputs → outputs) from memory.
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