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Activity 2

Activity 2. A Population of Duckweed.

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Activity 2

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  1. Activity 2 A Population of Duckweed

  2. LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the Science and Global Issues SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of Science and Global Issues within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of Science and Global Issues or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis.

  3. As you read the introduction, think about the following: • What is a population? • What is a community? • What examples of these terms did you read about in Activity 1, “Ecosystems and Change”?

  4. A population is a group of individuals of the same species that live in the same general area and are able to reproduce. • Populations of multiple species living in the same area are a community.

  5. Challenge • How quickly can a population grow? How does the size of a population change through time?

  6. Part A: Establishing a Baseline • Your group will be assigned an initial number of plants for your duckweed population. • Complete steps 1-6.

  7. Part B: Tracking the Population • Monitor your duckweed populations. Be sure to keep careful track of your population data. • At the end of the growing period, share your population data with the class.

  8. Did the duckweed populations grow as expected? • How are population growth and sustainability related?

  9. Analysis 1 • Interpret your graph by answering the following questions: • A. What happened to your duckweed population over the study period? • B. Why do you think your population changed the way it did?

  10. Revisit the Challenge • How quickly can a population grow? How does the size of a population change through time?

  11. Key Vocabulary • carrying capacity • community • ecosystem • invasive species • limiting factor • organism • population • population growth rate

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