5 labs
esolutions
what_molecules_q.docx
Photosynthesis &Respiration
Hands-OnLabs,Inc.
Version42-0102-00-01
Lab Report Assistant
Thisdocumentisnotmeanttobeasubstitute foraformallaboratoryreport.TheLabReport Assistantissimplyasummaryoftheexperiment’squestions,diagramsifneeded,anddatatables thatshouldbeaddressedinaformallabreport.Theintentistofacilitatestudents’writingoflab reports by providing this informationin an editable filewhich can be sent to an instructor.
Observations
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Data Table 1: PhotosyntheticRates |
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Rate |
Distance(mm) |
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Solutionstartingmeasurement |
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Net photosynthesis |
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Respiration |
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Gross photosynthesis (net photosynthesis + respiration) |
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Rate of photosynthesis (gross photosynthesis / 10 min) |
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Bag mass g + 1.5 g NaHCO3 = Final mass (g) |
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Data Table 2: Respiration Results |
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Experimental Conditions |
Startingdistance (mm) |
Final distance (mm) |
Change in movement (mm) |
Time (min) |
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With Elodea |
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Without Elodea |
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( Ex p e ri m e n t ) ( P hotosynthesi s& R esp i r a t i on )
( ww w . H O L s c i e n c e . c o m ) ( 130 ) ( © H a nds-On L a bs, I n c . )
Questions
Exercise 1:PhotosynthesisPartI
A. What molecules did the plant produce when exposed to light? B. What resources were consumed to produce the molecule?
C. What part did light play in the reaction?
D. What molecule was consumed by the plant while it was in the dark? E. What molecule was produced by the plant while it was in the dark? F. Where did the molecules go that were produced in the dark?
G. What criticalservice do plants provide humans?
H. Would animal life on Earth be possible without plants?
I. Would any life on Earth be possible without sunlight?
Exercise 2:PhotosynthesisPartII
A. WhenyoublewthroughthestrawintotheBromothymolbluesolution,whatgasdidyouadd? What color change did you observe in the solutionand why?
B. Whatcolorchangeoccurredafteryouplacedtheplantintotherespirometerandturnedon the light?
C. What was happening when the solutionin the horizontal tubing started to move? D. How long did it take the color change to occur afterthe solutionstarted to move? E. Why did the color change?
F. Whenyourepeatedtheexperimentwithoutaplantintherespirometer,whathappenedand why?
