All posts by David Swart

High school science teacher

Biome Research

Our goal for this week is for students to work together in their groups to conduct a deep-dive into their assigned biome and human-caused environmental disaster.  Students must share the work load equally, documenting their efforts in a shared team Google Doc.  Groups are expected to work together to identify scientifically credible resources and to document those resources in their Google Doc.  By Friday, everyone in the group should be able to:

  • Clearly describe the biome when it is healthy (long-term climate and major vegetation).
    • Is the weather the same year-round?  Describe in detail.
    • Are there seasons in your biome?  Describe in detail.
    • Where does your biome exist on a map?  Does your biome exist in multiple places around the world?
    • How are the organisms living in the region where your assigned disaster occurred similar or different to other parts of the world with the same biome?
  • Draw the major ecosystem(s) present within the biome as a food web (complete with nodes, edges, and properly drawn arrows indicating energy flow).
    • If your biome exists in multiple places on Earth, include food webs for each site.
  • Explain what humans did to cause the environmental disaster within the biome.
    • Specificity matters – include as many details as possible about the cause of the disaster.
    • Conduct a root cause analysis: keep asking “why” and dig as deeply as you can!
  • Clearly describe the biome when it is in crisis (as a result of the environmental disaster)
  • Explain how humans have attempted to correct the problem that led to the environmental crisis (what worked, what did not work)
  • Note: If your group finishes conducting research before Friday, craft your research into a research report.  Follow standard conventions for spelling, punctuation, and grammar.  Write in complete sentences.  Proof-read and edit!  Work as a team to construct a report you can be proud of submitting.

Your project team will be assigned a biome.  Your team may choose from the options provided, or propose a different topic (must be discussed with Mr. Swart before moving on).  If multiple groups in the same class period are assigned the same biome, teams must select different project options. Teams are expected to identify additional resources beyond those provided below and incorporate those resources into their research.

Selected Project Team Resources:

Ocean Biome

Desert Biome

Forest Biome

Arctic / Tundra Biome

Rainforest (including Jungle) Biome

Wetland (including Swamp) Biome

Mountain Biome

 

Combined Gas Law

For Lesson 61, students were introduced to the Combined Gas Law, k=PV/T.  We worked through the Lesson 61 PowerPoint and then students received the Lesson 61 Worksheet. During class, we also watched a portion of a video showing the effect of atmospheric pressure on balloon volume.

 

For homework, students were encouraged to work through textbook problems 1-7 and check work against the posted answer key.  This homework will not be entered into the grade book.

Ecological Challenges Presentations

Students presented their work from yesterday, with each student limited to a single minute of time to present their slide to the class describing the biome they researched and a man-made ecological disaster that occurred in that biome.  The audience was tasked with making a list in their notebooks that included the name of the presenter, the biome, and the disaster.  At the end of the presentations, students selected the top three biomes they want to continue researching.  Students will be strategically placed into groups designed to honor their interests and group identities will be revealed Monday.

Ecological Challenges

Our biome work continues today with students investigating the “human caused ecological disasters” they identified yesterday for the three biomes they selected.  Student groups will present preliminary findings to the class tomorrow.  Students should create one Google Slide for each of the biomes (one disaster per biome) and the slide should include as much of the following information as possible:

  • Year(s) the human-caused ecological disaster occurred
  • Description of biome pre-disaster
  • Explanation of what humans did to cause the disaster
  • Description of biome post-disaster
  • Effect of disaster on the plants and animals (including humans!)
  • Remediation efforts (how humans have tried to “fix” the damage)

Example of slide layout:

IMG_1925

A selection of resources are provided below:

SuperFund Sites in the USA

10 worst man-made environmental disasters

Earth’s Biomes

For our final section of the year, we end our study of Ecology first by studying the biomes of Earth, and then constructing models of the biomes complete with students solving a human-made problem found within each biome.

For our first day of work, students will assemble into groups of three students each.  Requirement: team members cannot have worked on a project together yet this year!

  • Step 1: Come up with a team name
  • Step 2: Select a unique color white board marker
  • Step 3: Given the definition of biome (a large naturally occurring community of flora and fauna occupying a major habitat, e.g., forest or tundra), race to list as many of Earth’s biomes as possible in two minutes
  • Step 4: Describe the key features of each biome, including
    • climate (the weather conditions prevailing in an area in general or over a long period)
    • dominant vegetation (plants)
  • Step 5: Select three biomes and research ecological disasters caused by humans.  Be prepared to share with the class.

Notes from the white board:

IMG_1919.jpg

Gay-Lussac’s Law

For lesson 59, we learned about Gay-Lussac’s Law (P=kT), the third gas law needed to connect pressure, volume, and temperature.  Gay-Lussac’s Law helps explain the egg-in-a-bottle trick, where boiled water displaces the air inside a bottle, and as the water condenses, an egg placed over the bottle will be pulled inside because of the change in pressure inside the bottle.

For students who missed the demonstration in class today, see the video below:

The Lesson 59 worksheet and Lesson 59 PowerPoint are available for download.  By the end of class tomorrow, students should be able to explain the outcome of the experiment below using Gay-Lussac’s Law:

Conclusion Writing

Reminder: Lab reports (one Google Doc per team shared with Mr. Swart), and the Plants Notes organizer (one per person) are both due Friday (May 25).  

Having acquired a deeper understanding of plant biology, we set our sights on the final piece of the Baggie Garden lab report: the Discussion / Conclusion section.  Remember, lab reports are organized into at least four parts in the following order:

  • Introduction (minimum of one paragraph)
    • State the scientific concept the lab is about.
    • Describe what you know about germination and how the lab is investigating the process of germination.  Include a discussion about how the energy used for germination is different from the energy used for plant growth.
    • State the hypothesis in if/then/because format for the experiment and then explain:
      • why this particular hypothesis was selected
      • how the experiment will add to your understanding of germination
  • Procedure:
    • Consists of a numbered list of steps
    • Each step includes one action
    • Must be detailed enough (including materials used) that someone unfamiliar with the lab could exactly repeat the experiment
  • Results
  • Discussion / Conclusion
    • Connect experimental results with Hypothesis.  Explain how the experimental design enabled you to test your hypothesis.
    • Explain how each manipulated variable affected the responding variable(s).  Be as specific as possible when describing the changes observed.  For example, as light intensity decreased from 200 lux to 40 lux (a decrease of 160 lux), the number of seeds germinating decreased from 80% to 40% (a decrease of 40%).
    • Explain how the data support your conclusion.  Regardless of whether your hypothesis was correct or incorrect, you now have data to help you better understand how the variable you selected impacts germination.  Explain that connection as thoroughly as possible.  By now, you may have read additional information about seed germination which may help you explain your results.  Include as much supporting evidence as possible from the sources you have examined.  If your results contradict what is published, explain how your results are different.  Provide a scientific explanation for the trend you observe in your data.
    • Provide a minimum of three possible sources of experimental error.  Explain how each possible source of error might influence the results your results.
    • Provide one opportunity to improve the experiment.  If you were to repeat this experiment, what would you do differently, and why?  Scientists work carefully and methodically, with experiments building on each other.  Think of your next experiment as the next step beyond your current experiment.

Boyle’s Law

Before we began our study of Boyle’s Law, we reviewed Charles’s Law of Ideal Gases:

Continuing with our study of pressure and volume, students learned about Boyle’s Law in Lesson 58.  Class began with a Sci Guys video about Boyle’s Law:

After the video, students took down a few notes from the whiteboard (below) and then worked through the Lesson 58 Worksheet.  For reference, students are also encouraged to review the Lesson 58 PowerPoint.

Charles’s Law
Boyle’s Law
Whiteboard notes for the Lesson 58 lab

 

Seed Germination and Cellular Respiration

With our seed germination experiment coming to a close yesterday, students are taking a break from writing the lab report in order to add to their knowledge about plants. We began with a Crash Course video about vascular plants:

Next, each student was assigned to read pages 758-763 from the textbook Biology (Raven & Johnson, 4th Edition, 1996).  Students recorded definitions to vocabulary words and summarized sections using the Plants Notes organizer.  The organizer is due Friday, along with the Lab Report, and should help students improve Introduction sections and help support their writing of the Conclusion section later this week.