ALEX Learning Activity

  

Crab Shell STEM Challenge

A Learning Activity is a strategy a teacher chooses to actively engage students in learning a concept or skill using a digital tool/resource.

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  This learning activity provided by:  
Author: Ginger Boyd
System:Geneva County
School:Samson Middle School
  General Activity Information  
Activity ID: 2376
Title:
Crab Shell STEM Challenge
Digital Tool/Resource:
Amazing Crabs Shell Exchange/Life Story/BBC Earth
Web Address – URL:
Overview:

In this learning activity, students will watch a video of crabs exchanging shells.  Then they will be challenged to design and construct a shell for their own Hermit Crab using specific criteria and constraints given by the teacher. Finally, they will complete an exit slip explaining what factors make their shell desirable for a hermit crab.  

This activity is a result of the ALEX Resource Development Summit.

  Associated Standards and Objectives  
Content Standard(s):
Science
SC2015 (2015)
Grade: 4
9 ) Examine evidence to support an argument that the internal and external structures of plants (e.g., thorns, leaves, stems, roots, colored petals, xylem, phloem) and animals (e.g., heart, stomach, lung, brain, skin) function to support survival, growth, behavior, and reproduction.


NAEP Framework
NAEP Statement::
L4.4: When the environment changes, some plants and animals survive and reproduce; others die or move to new locations.


Unpacked Content
Scientific And Engineering Practices:
Engage in Argument from Evidence
Crosscutting Concepts: Systems and System Models; Structure and Function
Disciplinary Core Idea: From Molecules to Organisms: Structures and Processes
Evidence Of Student Attainment:
Students:
  • Argue from evidence to support that the internal and external structures of plants function to support survival, growth, behavior, and reproduction.
  • Argue from evidence to support that the internal and external structures of animals function to support survival, growth, behavior, and reproduction.
Teacher Vocabulary:
  • argue
  • articulate
  • evidence
  • internal
  • external
  • structure
  • survival
  • function
  • behavior
  • reproduction
Knowledge:
Students know:
  • Internal and External structures serve specific functions within plants and animals.
  • The functions of internal and external structures can support survival, growth, behavior and/or reproduction in plants and animals.
  • Different structures work together as part of a system to support survival, growth, behavior, and/or reproduction.
Skills:
Students are able to:
  • Articulate an explanation from evidence explaining how the internal and external structures of plants and animals function to support survival, growth, behavior, and reproduction.
  • Determine the strengths and weaknesses of the evidence collected, including whether or not it supports a claim about the role of internal and external structures of plants and animals in supporting survival, growth, behavior, and/or reproduction.
  • Use reasoning to connect the relevant and appropriate evidence to support an argument about the function of the internal and external structures of plants and animals.
Understanding:
Students understand that:
  • Plants and animals have both internal and external structures that serve various functions in growth, survival, behavior, and reproduction.
AMSTI Resources:
AMSTI Module:
Animal Studies

Alabama Alternate Achievement Standards
AAS Standard:
SCI.AAS.4.9- Identify basic parts of plants and animals.


Learning Objectives:

Students will be able to examine evidence to support an argument that the external structures of a Hermit Crab function to support survival, growth, behavior, and reproduction.

  Strategies, Preparations and Variations  
Phase:
During/Explore/Explain
Activity:

Introduce the activity by asking the students if they know why a Hermit Crab needs a new shell. After giving students time to respond, explain that Hermit Crabs don't have shells of their own and must use the abandoned shells of other creatures. The crabs have soft abdomens and the hard shells protect their abdomens. When a Hermit Crab starts looking for a new shell, they check it out with their claw. The crab uses its claw to make sure the shell is the right size and nothing is inside. Then they slip into the new shell.

Watch the Amazing Crabs Shell Exchange video.

Explain to the students that now they will design and construct their own shells for a Hermit Crab. Students will partner up to complete the challenge. Pass out the rubrics (one per student). Each pair will design and construct a shell for a Hermit Crab that will withstand the weight of the Dixie cup holding 20 pennies (or any predetermined amount of weight). The large cotton ball will be the "Hermit Crab" and must fit inside the shell when the shell is held up and must stay inside the shell without any help (tape or hands). Students should be able to remove the "Hermit Crab" by gently tugging on it.

After a predetermined amount of time, I usually give my students 30 minutes to work on their shells, have the students complete the exit slip.

Assessment Strategies:

Use the exit slip and the Crab Shell STEM Challenge Rubric to ensure students can provide evidence to support an argument that the external structures of a Hermit Crab function to support survival, growth, behavior, and reproduction.


Advanced Preparation:

Exit slip - one copy for each student

Crab Shell STEM Challenge Rubric - one copy for each student

Teachers will need to gather the materials for the Mobile Home Crab Shell Challenge:

egg cartons            aluminum foil

toilet paper rolls     paper plates

pipe cleaners          tape

styrofoam cups       rubber bands

bubble wrap            newspaper

card stock               large cotton balls (crab)

Dixie cup with 20 pennies

Variation Tips (optional):

The teacher can determine the weight and time limit as well as change the required materials for this challenge.  

Notes or Recommendations (optional):
 
  Keywords and Search Tags  
Keywords and Search Tags: animal behaviors, external structures, Hermit Crabs, organisms