Summary
Students investigate what it means to be alive. Students sort itemsinto three categories: living, nonliving, or once living. Yeast and cornmeal aresimilar looking powders and students will conduct an experiment to see if eitherpowder is alive. A terrarium is used to demonstrate to students that living,nonliving, and once living materials all interact in an ecosystem.
Materials
Attachments
- livingterrariumstudentsheet.pdf
- sortingsheets.pdf
- Living Terrarium Student sheet
- Sorting sheets
- Living, nonliving, and once living sorting sheets
- Items for the sorting activity. There are many possibilities for items to sort.Try and have at least 5 -- 6 items for each category. Examples of living items are:a mealworm, a plant with roots, soil with microorganisms, and pond water withmicroorganisms and/or insect larvae. Examples for once living items are: pieceof bark, dead grass, a dead insect, flour, wood, pine cone, bird feather, sea shell,and an apple. Examples for nonliving items are: rock, plastic animal, sand,spoon, pen, glass cup, penny, and bouncy ball.
- 1 tsp. of cornmeal in a Ziploc bag marked 'unknown 1', one per group
- 1 tsp. of fast acting yeast in a Ziploc bag marked 'unknown 2', one per group
- 2 tsps. of sugar per group
- Warm water -- usually hot water from the tap will be the correct temperature(about 70 -- 80 degrees Fahrenheit)
- Measuring spoons
- Make a living/nonliving environment. Set up a terrarium or aquarium with avariety of living, once living, and nonliving items. For the living component youcan have plants, crickets, worms, a frog, and/or fish. For the nonlivingcomponent you can have rocks, gravel or a plastic dish for water. For the onceliving component you can have sticks, pinecones, or dead grass.
Background for Teachers
To be classified as a living organism, an object must be able to do all ofthe following activities: grow and change, organization (composed of cells), metabolism, homeostasis, response to stimuli, reproduction and adaptation. Be able to use energy by eating and/or,responding to its environment.
For an organism to be classified as once living, an object must have beenpart of a living organism or is now dead. When a flower is plucked from a plant itis hard to distinguish between when it is considered alive and when it is nowconsidered once living. An example of a nonliving object is an apple or a deadleaf.
A nonliving object may have some characteristics of living things but doesnot have all 5 of the characteristics. A car can move and use energy, whichmakes it seem alive, but a car cannot reproduce. An object needs to have all 5characteristics of life in order to be classified as live. Examples of nonlivingobjects are cars, water, fire, and mountains.
Intended Learning Outcomes
1b. Sort and sequence data according to a given criterion.
1c. Make simple predictions and inferences based upon observations.
1d. Compare things and events.
3a. Know science information specified for their grade level.
3b. Distinguish between examples and non-examples of science concepts taught.
3c. Explain science concepts and principles using their own words andexplanations.
4a. Record data accurately when given the appropriate form and format.
4b. Report observation with pictures, sentences, and models.
4c. Use scientific language appropriate to grade level in oral and writtencommunication.
Instructional Procedures
Pre-lab discussion: Show students a rock, a stick, and a mealworm. Ask thestudents which one is living, nonliving, and once alive. Ask students what itmeans to be alive. Have them come up with the five characteristics and writethem on the board. Show the students the bags of yeast and cornmeal and havethem predict if one, either, or both are alive. Have students make a predictionand discuss a way to experiment on their prediction.
Instructional Procedures:
I. Sorting Living, Once Living or Nonliving Objects II. Which One is Alive? III. Living and Nonliving Interactions in an Ecosystem Rio Tinto Hands-on Science Curriculum Team
Does it breathe?
Does it eat?
Does it respond?
Does it reproduce?
Does it grow?
Is it living, once living or nonliving? It is important to realize that there iscontroversy over where to put such items as an apple or seed. Let the kidsdecide where it should go and realize there is no absolute correct answer on this.
Bibliography