Effect Environment Assignment PDF

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Summary

Environmental Science. 2021-2022. Nov 2021. HHHHHHHHHHHH...

Description

Name: _____________________

Date: ___9/8/2021__________

Student Exploration: 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. Johnny might measure which bird seed cardinals happen to have a couple of bird seed out in the open, and see which bird seed is eaten the most. For example, let us say that it is a cardinal who eats it and notes a different bird.

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. 1. The new life form can have three shapes: thin, medium, and thick. How many of each shape are there now? Thin: _74__

2. Click Play (

Medium: __19___

Thick: __7__

). Do the numbers of each type of alien change over time? __Yes______

3. 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? Light, water and temperature

4. Which of these variables do you think will have the greatest effect on the aliens? Explain. The water because it can help the aliens in ways such as living because you can’t live without it.

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Activity: Controlling variables

Get the Gizmo ready: ● Click Reset. ● Select the BAR CHART tab. ● Turn on Show numerical values.

Question: What variables control the shape of the alien life forms? 1. Record: Record the starting numbers of thin, medium, and thick aliens: Thin: _74___

Medium: _19___

Thick: _7___

2. Observe: Change the Light to 0 hours/day, the Water to 1 drops/hr, and the Temp. to 0 °C. Click Play, and observe the aliens until the numbers are stable. Click Pause. A. How many of each type of alien are there now? Thin: __2__

Medium: __8___

Thick: __90___

B. Click Reset. Change the Light 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? Thin: __90___

Medium: __8___

Thick: __2___

3. Analyze: From the observations you made above, can you state exactly why the aliens changed their shape? Why or why not? The temperature because of the way they need to change as the temp dose like animals do.

4. Form a hypothesis: A hypothesis is a proposed explanation for an observation. Hypotheses must be testable. Write a hypothesis about what causes the aliens to change their shape. If the temperature changes then the number of skinny and thick aliens would change.

(Activity continued on next page)

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Activity (continued from previous page) 5. Design an experiment: A controlled experiment is an experiment in which only one variable is changed at a time. Describe a controlled experiment you could use to test your hypothesis. The total number of the aliens and water. 6. Run the Gizmo: Run a controlled experiment to test your hypothesis. Describe the results of your experiment below. That it didn't really change as much. 7. Run the Gizmo: Run controlled experiments to determine the effect of each variable. A. How does changing the amount of light affect the aliens? I think that changing the amount of sunlight would have no effect on the shape of the aliens. B. How does changing the amount of water affect the aliens? It affects how much food they can consume. C. How does changing the temperature affect the aliens? It affects the way they consume their food. 8. Draw conclusions: Which variable or variables affected the aliens? Temperature 9. Think and discuss: Why is it important to only change one variable at a time? If possible, discuss your answer with your classmates and teacher. To see the true effect alone on the variable that affects the experiment.

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