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Student Exploration- Effect of Environment on New Life Form (answers)

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Author: Jack Bauer
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Effect of Environment on New Life Form

Vocabulary: controlled experiment, hypothesis, variable

Prior Knowledge Question (Do this BEFORE using the Gizmo.)

Johnny likes to watch the birds that visit his birdfeeder. His favorite bird is the cardinal. How could Johnny determine which kind of birdseed cardinals prefer? Explain your answer in detail.

Gizmo Warm-up

Imagine a new alien life form has just been discovered on a nearby planet. Your job is to study this new life form. The Effect of Environment on New Life Form Gizmo™ shows 100 individuals that have been transported from the planet to your laboratory.

The new life form can have three shapes: thin, medium, and thick. How many of each shape are there now?

Thin: Medium: Thick:

Click Play (). Do the numbers of each type of alien change over time?

Click Reset (). A variable is something that can be changed in an experiment. Look on the SIMULATION pane. What are the three variables you can change in your laboratory?

Which of these variables do you think will have the greatest effect on the aliens? Explain.

Activity:

Controlling variables

Click Reset.
Select the BAR CHART tab.
Turn on Show numerical values.

Question: What variables control the shape of the alien life forms?

Record: Record the starting numbers of thin, medium, and thick aliens:

Thin: Medium: Thick:

Observe: Change the Sunlight to 0 hours/day, the Water to 1 drops/hr, and the Tempto

0 °C. Click Play, and observe the aliens until the numbers are stable. Click Pause.

How many of each type of alien are there now?

Thin: Medium: Thick:

Click Reset. Change the Sunlight to 24 hours/day, the Water to 20 drops/hr, and the Temp to 30 °C. Click Play. How many of each type of alien are there now?

(more)

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