Thursday, June 21, 2012

Living, Non-living vs. Dead Lab

Part 1 (Living-Nonliving Part 2)

I have found that it is worth spending two full class periods on a lab that challenges students' preconceptions of what it means to be alive! I designed this lab years ago, and it remains a favorite of mine. A free student handout is available at the end of this article.
The day before lab day (may only need a 1/2 class period) we brainstorm qualities that living things must have. At this point I just let students list a bunch of things on the board, and I don't filter them at all. Then as ideas slow down, we start lumping overlapping ideas together. From our list, each student chooses 10 to list on their data table. Below is a list of common characteristics student usually come up with. Remember, its OK if they come up with characteristics that are not the  actual characteristics of life. By completing the lab, they'll figure out that some of the characteristics they choose are not good indicators of life! And some that might be the best indicators are not always easy to observe!
  • need air
  • breaths
  • poops
  • exhales
  • moves
  • reacts to stimuli/environment
  • needs food/eats
  • needs water/drinks
  • has cells 
  • has atoms
  • it can die (I love this one)
  • thinks
  • has babies/offspring
  • has genetic material
  • has chemical reactions going on inside of it
The next day, the students rotate around to 12-15 stations. Student's goal is to determine which characteristics they have in their chart apply to the entity they are observing. Then, they must make a final decisions as to whether or not the item is living, non-living, or dead. This is what the table looks like.
When deciding what to put at each of the stations, I like to choose some that are easily identifiable as living & dead, and others that are more difficult and will provide a wonderful opportunity to discuss. Here is a list of items I have used in the past. Living = L, Non-Living = NV, Dead = D.
  • rock (NV)
  • potted plant (L)
  • freshly cut flower in water (L, we have fun with this and the next one)
  • freshly cut flower not in water (L...but dying?)
  • yeast in warm water and in water bath (L)
  • oil in water with green food coloring, and in a warm water bath (NL)
  • candle flame (NL--another fun one to discuss)
  • sewer lice (NL)
  • microscope station set up slide of an elodea leaf (L)
  • microscope station set up with a slide of a wet mount of just water and focus on an air bubble! Looks like an amoeba  (NL)
  • microscope station set up with a slide of yogurt (L)
  • mold growing on food (L)
  • goldfish swimming (L)
  • cork (D)
  • apple (L)
  • package of seeds (L, Usually students say D, but during discussion, we are able determine that although it has no characteristics of life, now, it has the potential to, and therefore is living...usually a student comes up with the word hibernate to describe seeds.)
  • germinating seed (L, good to use in comparison to the seeds in a package)
  • Sewer Lice or Dancing Raisins- raisins bobbing in clear soda pop (NL-D?)
  • Glue Monsters- wood chips being eaten by Duco cement (NL-D?) (I have posted videos of this in part 2 of this post!) 

Students then must finish the post lab questions for homework. In these questions, students must synthesize which characteristics are the best indicators of life, they share what areas they are most certain, and others where they feel they don't have enough information. Questions also challenge them to really look at how their observations measure up to their "gut feelings" about some of the items. Its common for students to know that the candle flame is non-living, and yet it has more check marks of characteristics of living things, then some of the items they know to be living. I have them think about what this may mean, and what it may indicate about how hard it is to classify items as living or non-living!

My favorite question is one where they must pick an item they characterized as non-living, and for fun, argue that it is living. Many students choose candle flame, since it has many of the characteristics.  The last page of the lab has a list of other items that they must put through their vetting system and characterize. Some of these include, whale sperm, HIV virus, chicken egg bought in a grocery story, and fertilized egg. I tell them I won't be grading their lab for the "book answers," instead, I want them to really THINK, and as long as they can verbally,and in their written answers defend why they've classified a certain item, they can receive full credit! As you can imagine, students come in the next day excited to defend their position on some of these items. We really enjoy the day after lab as it provides that opportunity for rich discussion. Some years I tell them what was at each station, and other years I don't. During these discussions I encourage peer-peer interaction, only interjecting questions  like "So, what happens if I put water on the flame?" 

I originally designed the Living, Non-Living lab as a way to introduce the characteristics of life. I figured it was better for them to begin our biology class understanding that its is not as easy  as they may think to define life.  But I soon discovered that the students learned several other important scientific skills as a result of this lab. Because it is the first lab of the school year in my biology class, it is a perfect lab to help me introduce my students to lab stations, lab safety, and the behavior I expect in the lab. Therefore, the best aspect of this lab is the discussions it encourages the student to have. It helps me to foster that environment of taking guesses, helping student to not worry about being wrong, but making predictions based on what they already know.  

The free printable is the student handout which is 4 pages long. The first page includes the brainstorming questions you might cover in your discussion the day before the activity. The data table where they record their observations is on the last page, and the other pages include postlab questions, based on a wonderful discussion we had on the NSTA listserves! I would LOVE feedback if you decide to use this lab!


Living-Nonliving Part 2: I've written another post on how to make stations "tricky." It includes a tutorial of how to do the "Glue Monsters" demo, and I include a video, if you can't spare the time to do the demo yourself!

I'd love to hear what you've done to help teach these important ideas and skills!

16 comments:

  1. I'm bookmarking this one! It's coming up in our fall studies, and your lab looks way more interesting that what I'd planned! Thanks for sharing.

    ReplyDelete
    Replies
    1. Yeah! I'm so glad you like it. I hope to be adding photos sometime this summer. If you use it, I'd love to know how it went!

      Delete
  2. I'm looking forward to trying some of your ideas with my kids over the summer! I nominated you for The Sunshine Award. Check it out at http://worstmome.blogspot.com/2012/06/sunshine-award.html

    ReplyDelete
    Replies
    1. Patricia, Thanks so much for stopping by and for the nomination! :)

      Delete
  3. Do you have the Lab write up yet. If so could you email it to me. Im a new teacher and this sounds perfect. logan.newbill@gmail.com

    ReplyDelete
    Replies
    1. Sorry, I've been focused on doing Wind Turbine lessons this summer, and haven't done this with my class yet this year. As soon as I do, I'll email it to you! :)

      Delete
  4. Darci, I used this in my 9th grade bio class today as a first day activity; it really got my students thinking and little confused (in a good way)! We made it through the stations and are going to have discussion tomorrow. I was planning on coming up with some follow up questions for them to answer independently for homework and was wondering if you had any share. Thanks for the great activity!

    ReplyDelete
    Replies
    1. So glad you enjoyed it! I would love to hear how the discussion went. I also think you'll find that students will often refer BACK to this early in the year discussion. Its thought provoking, and their ideas on what defines something as living starts out so black and white, and the more they learn about science, the more they realize (or should anyway) that its not always to cut and dry! So glad you liked the lesson!

      Darci

      Delete
  5. I love this. I have never come up with a good way to make this topic hands on. 2 questions. 1) do you tell them what the yeast is or just have them observe the solution? 2) does the oil and water look diff in a water bath? I don't have one and would need to set it up in a beaker of water on a hot plate if it was necessary for the desired affect.

    ReplyDelete
    Replies
    1. Nicole,

      1) I try to resist the urge to tell them what the items are. Some years I do, and other years I don't. I like the idea of secrecy, but I also think a lot of valuable learning can occur once they've spent some quality time explaining their reasons for categorizing an item living, non-living, or dead.

      2) I think the more you make students think in needs a certain environment (like putting it in a water bath) the more likely they are to think it is living! But even making comments to the class, such as "How is the temperature of that solution over there? Is it getting cooler?" It just makes them think a little! (he-he)

      Delete
  6. I'm posting an email I got regarding this lab.

    Hi Darci,

    Just wanted to say THANK YOU for sharing your ideas & labs. I really appreciate it! I used your “ Living or Non…” activity with my students the first day of class. It was a great activity to get them thinking & up & moving around the room. I also brought up the Mars rover in our discussions – and we had some great discussions. The next class period, as their warmup, I have the students read the story “Is Sammy Alive” & then have them discuss their thoughts in a group & share out to the class. I followed up with a short writing assignment where they had to tell me whether or not he was alive. If he was dead, when did he die. They then had to support their position with information from the story & what they knew about the characteristics of living things. Finally, they had to list as many characteristics of living things as they could remember.

    I definitely liked the lesson & the students seemed to enjoy it as well. I plan on using it in the future!!

    Thanks again.

    K

    ReplyDelete
  7. I've been asked to turn my school into a STEM school in the next two years. Thank you for sharing your amazing lessons.

    ReplyDelete
  8. Awesome idea! My kiddos have been struggling with the concept of what it means to be alive and this is exactly what we needed to figure that out!

    ReplyDelete

I love comments! Would love to know you were here! :)

Related Posts Plugin for WordPress, Blogger...