Autumn Leaf Science
Understand why leaves change color in the fall
In this lesson, students will investigate why leaves change color in the fall through a hands-on experiment and a discussion. This lesson helps students understand the scientific processes behind seasonal changes, fostering curiosity and a love for science.
Understand why leaves change color in the fall
Leaves collected prior to the lesson, White paper, Rubbing alcohol, Glass jars, Plastic wrap, Bowls, Hot water, Worksheet: Autumn Leaf Experiment, and Discussion Guide: Why Leaves Change Color
- Greet the students and introduce the topic.
- Ask if anyone knows why leaves change color in the fall.
- Explain that today, we'll explore the science behind this colorful change.
Step 2
Experiment Setup
10 mins
- Distribute the collected leaves, glass jars, white paper, and rubbing alcohol.
- Demonstrate how to place leaves in the jar, cover them with rubbing alcohol, and mash them up.
- Cover the jar with plastic wrap and place it in a bowl of hot water.
- Explain the safety precautions while working with rubbing alcohol and hot water.
Step 3
Observation and Explanation
15 mins
- Ask students to observe the changes in the jar and share their thoughts.
- Discuss how the rubbing alcohol breaks down the chlorophyll, revealing other pigments such as carotenoids and anthocyanins.
- Hand out the 'Autumn Leaf Experiment' worksheet and guide students to fill it out based on their observations.
- Use the 'Why Leaves Change Color' discussion guide to facilitate a conversation.
- Discuss questions such as: 'What did you observe?', 'Why do you think these changes happen?', 'How do these changes benefit trees?'
- Encourage students to share their thoughts and relate their findings to real-world examples.
- Recap the key points learned in the lesson.
- Ask students to share one interesting fact they learned about leaf color change.
- Thank the students for their participation and enthusiasm.
