Lesson Plan: Tropism

Grade Level: MYP 5 (10th grade)

Subject: Biology

Time Duration: 60 minutes

Learning Objectives: 1. Understand the concept of tropism and its significance in plant growth and development. 2. Identify and differentiate between different types of tropism (phototropism, gravitropism, and thigmotropism). 3. Analyze and explain the mechanisms behind tropism in plants. 4. Apply knowledge of tropism to real-life examples and scenarios.

Materials: - PowerPoint presentation - Whiteboard and markers - Plant specimens (e.g., potted plants) - Rulers or measuring tapes - Worksheets or handouts - Internet access (optional)

Procedure:

Introduction (5 minutes): 1. Begin the lesson by asking students if they have ever noticed how plants grow towards light or bend towards a certain direction. 2. Introduce the concept of tropism as the growth or movement of a plant in response to an external stimulus. 3. Explain that plants exhibit different types of tropism, such as phototropism, gravitropism, and thigmotropism, which will be explored in detail during the lesson.

Main Lesson (35 minutes):

1. Phototropism (10 minutes): a. Define phototropism as the growth or movement of a plant towards or away from light. b. Show examples of phototropism in plants using images or videos. c. Discuss the role of auxin hormone in phototropism and how it causes differential growth in plant cells. d. Conduct a simple experiment to demonstrate phototropism using potted plants and a light source. Observe and record the plant’s response to light.

2. Gravitropism (10 minutes): a. Define gravitropism as the growth or movement of a plant in response to gravity. b. Show examples of gravitropism in plants using images or videos. c. Explain the role of auxin hormone in gravitropism and how it causes differential growth in plant cells. d. Conduct a simple experiment to demonstrate gravitropism using potted plants and rulers or measuring tapes. Observe and record the plant’s response to gravity.

3. Thigmotropism (10 minutes): a. Define thigmotropism as the growth or movement of a plant in response to touch or contact. b. Show examples of thigmotropism in plants using images or videos. c. Discuss the role of auxin hormone in thigmotropism and how it causes differential growth in plant cells. d. Conduct a simple experiment to demonstrate thigmotropism using potted plants and gentle touch. Observe and record the plant’s response to touch.

Conclusion (15 minutes): 1. Recap the main points discussed during the lesson, emphasizing the different types of tropism and their mechanisms. 2. Engage students in a class discussion on the significance of tropism in plant growth and development. 3. Assign a worksheet or handout for students to apply their knowledge of tropism to real-life examples and scenarios. 4. Encourage students to research and present additional examples of tropism in plants for the next class.

Assessment: - Observe students’ participation and engagement during class discussions and experiments. - Evaluate students’ understanding through their completion of the worksheet or handout. - Assess students’ ability to apply their knowledge of tropism to real-life examples and scenarios during the class discussion.