Lesson 3: Seeds, Fruit, and Dispersal

How do the yellow flower heads turn into white "puffballs"? How does the wide-open nature of the baseball field help dandelion seeds sweep across the entire grass turf?

Monocot, Dicot, Endosperm, Cotyledon, Seed Coat, Fruit, Dispersal (Wind, Water, Animal).

DCI: LS1.B (Growth and Development of Organisms); SEP: Analyzing and Interpreting Data; CCC: Structure and Function.

Mathematics in Science: Reading complex informational texts, interpreting visual charts, and evaluating seed travel efficiency based on structural design.

(DOK 3 - Strategic Thinking) Students test physical models of seed structures to determine how aerodynamic properties maximize regional dispersion. While daily classwork transitions from initial qualitative conceptual models ("Where Do Seeds Come From?" activity and Readworks: Seeds Need to Move textual tracking) to structured data collection (Exploring Seed Structures anatomy tables), the sequence culminates in a DOK 3 milestone assessment. During the Seed Dispersal Lab and LP 1.4 Checkpoint, students must collect quantitative travel data from a wind tunnel simulation, evaluate the structural efficiency of seed parachutes (pappus), and revise physical models to optimize wind-driven seed transport.

Baseball Field Dandelions: Students monitor the rapid life cycle shift from a fertilized flower into a white, geometric seed head. They analyze how the open, flat wind corridor of the baseball outfield acts as the perfect environment for the dandelion's specialized parachute structure (pappus) to achieve high-efficiency wind dispersal, planting new weeds across the diamond.

Students often believe that a fruit's only ecological purpose is to act as an energy-rich "food packet" to feed the growing embryo, rather than serving as a mechanism to help seeds travel away from the parent plant. .

Differentiation by Content:
Tiered Assignments: Create assignments with varying levels of difficulty to cater to students' abilities. For example, offer a basic level assignment, an intermediate level assignment, and an advanced level assignment.
Flexible Grouping: Group students based on their readiness levels or learning styles. This allows you to provide targeted instruction and support to different groups of students.
Choice Boards: Offer students a variety of activities to choose from, allowing them to select tasks that align with their interests and learning styles.
Differentiation by Process:
Scaffolded Instruction: Break down complex tasks into smaller, manageable steps to support students who need additional guidance.
Graphic Organizers: Provide students with visual tools like Venn diagrams, concept maps, and timelines to help them organize information and make connections.
Technology Integration: Utilize technology tools like simulations, online resources, and educational apps to engage students and provide alternative learning pathways.
Differentiation by Product:
Multiple Assessment Options: Offer students a variety of ways to demonstrate their understanding, such as written reports, presentations, models, or digital projects.
Student Choice: Allow students to choose the format for their final projects, giving them ownership over their learning.
Rubrics: Develop clear and specific rubrics to provide students with expectations and guidelines for their work.

LP 1.3 & LP 1.4 Checkpoint (Quiz)