scientific fair test
DESCRIPTION
Scientific Fair Test. Toxic water. We are learning to:. Conduct a fair test investigation following the scientific method in order to determine the effect of toxic water on seed germination and root growth . At the end of the investigation students will be able to:. - PowerPoint PPT PresentationTRANSCRIPT
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Scientific Fair Test
Toxic water
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We are learning to:• Conduct a fair test investigation following the scientific method in order todetermine the effect of toxic water on seed germination and root growth.
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At the end of the investigation students will be able to:
• Determine the effect of toxic water on seed germination and root growth.
• Create a research question and hypothesis based on their prior research.
• Plan and conduct an investigation.• Make observations, record results
and graph.• Make a results statement and
conclusion.
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What went down the drain?• Detergents – Soaps• Organic material - Leaf litter and grass cuttings• Pesticides – poison• Run-off water from washing cars• Sewer overflows• Fertilisers• Leaks from cars and trucks• Animal and bird droppings• Septic tank leaks
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Investigation
• Today we will prepare for an investigation to look at the effects of water pollution on seed germination and root growth.
• The investigation will run for about five days – depending on germination and root growth.
• Students will work in groups
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GroupsGroup 1 Group 2 Group 3 Group 4 Group 5Stephanie (L)TarynJamesIsraelGeorgia
Sharna (L)AugustHarryKarn
Liam (L)CoreyNatasha EmmaJosh
Daniel (L)HunterTaylorDestiny
Briar (L)CainDylanJaden
Get your topic study books, glue stick, pencil, eraser and red pen and move into your groups.
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Activity 1• Glue Scientific Investigation Instructions in your topic
book.
• Read through the sheet – at the end you may ask questions for clarifications.
• Be prepared to explain the investigation in your own words. (5 min)
• Look at the information you got from your internet research – Activity 6
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Activity 2 – Draft question
• Design a draft research question based on prior discussions and the list of materials.
• Discuss in your group and write up on a piece of scrap paper.
• 4 minutes
Examples:• Does water quality
effect seed germination and root growth?
• What kind of water makes seeds germinate and roots grow best?
• Does water pollution affect seed germination and root growth?
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Write:
31-08-2009 Toxic water investigation
• Research question: (Write down the question your group has agreed upon)
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Activity 3 - hypothesis
• From your research question comes the hypothesis.
• Now in your group come up with your hypothesis (prediction)
Examples• More seeds will germinate
and roots grow longer in clean water.
• Seeds will not germinate as well in polluted water and the roost will be shorter.
• The water with the most pollution will have the lowest germination and root growth.
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Write:
31-08-2009 Toxic water investigation
• Research question:
• Hypothesis (my prediction) (Write down the prediction your group has agreed upon)
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Activity 4 – Controlled variables
• Look at the “equipment and materials” and the “things to know”.
• What are the controlled / dependent variables? (What will be the same?)
Controlled variables:• Container size• Absorbent paper• Lettuce seeds• Amount of darkness in
which the seeds germinate
• The place where the seeds germinate
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Write:
31-08-2009 Toxic water investigation
• Research question:
• Hypothesis (my prediction)
• Experiment – Controlled variables: (List)
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Activity 5 – Independent variables
• Look at the “equipment and materials” and the “things to know”.
• What is the one thing that will be different?
The water quality• Laundry detergent
water• Dish washer water• Soap water• Shampoo water• Oil water• Animal droppings water
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Write
31-08-2009 Toxic water investigation
• Research question:
• Hypothesis (my prediction)
• Experiment – Controlled variables:
• Experiment – Independent variable: (List)
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Activity 6 - Control
• Identify the control.• The one thing that will show us normal germination and root growth is if we use…..
• Clean tap water.
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Write31-08-2009 Toxic water investigation
• Research question:
• Hypothesis (my prediction)
• Experiment – Controlled variables:
• Experiment – Independent variable:
• Experiment – Control:
• Experiment:
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Activity 7
• In your groups, read the “lettuce seeds procedure”.
• Discuss what to do – in your own words – do we all agree what to do?
• Now write up in your own words what you will do / how you will set the experiment up.
• Support your buddies.
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The experiment
Part 2
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The experiment• Today we will be setting up and
running the experiment based on the procedure you wrote up yesterday.
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Step 1: Organise the equipment & materials
Each group will get:• 4 x 1.5litre containers • 2 x pollutants• 1 x salt solution• Masking tape for marking• 4 x dishes with lids• 2 x absorbent paper discs • 1 x tweezers• 1 x ruler• 4 x eye droppers• Aluminium foil
Behaviour and safety:
• Work area• Handle of chemicals• Keep fingers out of
mouth and don’t rub eyes
• Wash hands after each session.
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Step 2: Water samplesEach group creates their own water samples
• 1 x control - clean water• 1 x salt solution (500ml water, 250ml non-
carbonated water and 250ml salt)• 2 x pollutants (100ml and pollutant)
Label water samples with:• Content • Date• Ratio of the mix
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Step 3 • Place an absorbent disc in each of the four
disks / containers• Label the four disks / containers A – Salt solution
B – Pollutant 1C – ControlD – Pollutant 2
Write this information in your topic book
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Step 4• Use a clean eye dripper.• Add just enough water (about 4ml) to
wet the absorbent paper in the disk / container marked C
• Do the same for sample A, B and D using a clean eye dripper so that you don’t contaminate your samples.
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Step 5• Use the tweezers, select 20 lettuce
seeds and place them on the bottom side of each disk / container.
• Arrange them in rows of 4 or 5• Cover with absorbent paper disk • Place the cover on the disk /
containers.• Carefully wrap each disk in foil
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Step 6• Store in room temperature that will
not be disturbed for 5 days.• No direct sunlight or other heat source that will dry the absorbent paper out.
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Write:
• Write up the experiment – what you have done.
• Be very specific and detailed
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Observation Part 3
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• Use the seed germination and root growth recording sheet to record observations.
• Have a pencil and ruler ready
• Lay the ruler on a clean blank paper.
• Carefully unwrap and open the disks / containers
• Count the numbers of seeds that have germinated and record.
• If there is enough root growth to measure use the tweezers to carefully lift.
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• The edge of the root is at 0 so only the root is measured.
• Record the lengths of all the roots.
• Calculate the average
• Cover seeds – Leave for 3 more days before observation is repeated.
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Interpret the data
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InterpretationGraph 1
• Create a graph in which the y axis show the number of seeds germinated over the 5 days and with the x axis showing the different water samples.
Salt w
ater
Oil wate
r
Pure wate
r
Catego
ry 4
02468
Number of seeds that ger-minated after 5 days
Number of seeds that germinated af -ter 5 days
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InterpretationGraph 2
• Create a graph in which the y axis show the measurement of root growth over the 5 days and with the x axis showing the different water samples / pollutants.
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Interpretation Result statement
•Write a simple result statement after interpreting the data and studying their observations
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Conclusion• Now write your conclusion
with a statement about whether the data supported your original
hypothesis (prediction)
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Final assessment task• Use the information you have
gathered and present a summary of the investigation on a display poster.