Modeling Cellular Respiration (Part 2/2)

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Objective

Students will design their own experiment to compare the respiration rates of an organism of their own choosing with germinating seeds.

Big Idea

Every living thing needs cellular respiration...I mean, everything.

What Students will Learn in this Lesson

1 minutes

In this lesson, students will use the protocol that they practiced yesterday to compare the rate of respiration between several different types of seeds. This is the assessment portion of the cell respiration lab. This is day 2 of a two day lesson.  Here is an overview of what students will learn today.

Hook/Check for Understanding

3 minutes

Using the responses provided by students in yesterday's lab, show the students Wordle. Have students to discuss the important key terms and their relationships.  Ask students what words are the largest and what those words have in common? Next ask students the second largest words and what those words have in common. 

Student Activity: Writing the Lab Proposal

15 minutes

Give students the following proposal template and rubric. Students will design a proposal that will compare the respiration rates of various types of seeds, fungi, or protists using the protocol from yesterday.  

Equipment Provided for Use

  • Vernier Labquest
  • Logger Pro
  • Vernier carbon dioxide gas sensor
  • Vernier oxygen gas sensor
  • Vernier temperature probe
  • Biochamber 250
  • Several types of fast germinating seeds (Some of these will need to be pre-germinated)
  • yeast culture
  • hay infusion culture (protists)
  • distilled water
  • tap water
  • ice cubes
  • Vernier temperature probe
  • 100mL beakers
  • paper towels
  • KimWipes
  • Hot plate
  • 250 mL beaker

Ask students to design a lab that will test the respiration rate of a living thing.  Students' lab designs will vary and may or may not use all of the equipment listed above. Before they start the performance portion of the assessment, they will need to submit their design for approval.  Students will need to revise their proposal until they are approved. Once approved, student groups may begin their experiment. 

 

 

 

Student Inquiry Lab: Determining Another Organism's Respiration Rate

30 minutes

After their proposal has been approved, students will need to test their proposal.  Since students' experiments will vary, see the attached student work. Teacher should move about the room answering students' questions and monitoring their work.  The teacher should monitor students' performance using the following rubric

Putting It All Together: How Did It Compare?

5 minutes

Students should compare their lab results with the results from yesterday's lab.  Discuss as a class the similarities and differences between the seeds.  Hand students the formal lab report rubric and discuss with students how they should report their results.  Students should be given two days to write the lab report.