# Ian Cisternas - Photosynthesis Analysis.pdf - Name: Date:...

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Name: _____________________________ Date: _____________ Class: ____________Lab BiologyUnit 5 - Matter & Energy for LifeIntro to Photosynthesis - Analysis of EvidenceWhere does a plant's mass come from?In this activity, you willanalyze evidenceto learn more about each of these studenthypotheses.For each hypothesis in the cartoon below: First, identify what each student is claiming to be thesourceof the mass. To do this,circle the wordin each hypothesis.Next, write aTif you think the hypothesis is true or anFif you think the hypothesis is false.Student AStudent BStudent CStudent D_T______T____F____T_____Background:Through chemical composition analysis, the molecules and even elements canbe determined of any substance/matter. With this technology scientists now know that plants aremade up of two types of molecules: water and organic molecules (molecules in living thingsmade with mostly C-H-O-N).Based on information learned in previous units, what does C-H-O-N stand for? _carbon,hydrogen, oxygen, andnitrogen___________________________________________________________________________
EVIDENCE #1 - Plant Mass vs. Total Mass:Our first question is how much of a plant’s massis water and how much is organic molecules. To find out, you can weigh a plant, then dry theplant in an oven to remove all the water, and then weigh the dried plant. This table showsrepresentative results for a small plant. Complete the second and third columns of the table.Weight% of plant’smassTotal mass of plant5.6grams100%Mass of dried plant = mass of organic molecules in plant =biomass1.4gramsMass of water in plant before it was driedA.Do the results you calculated for Evidence #1 support any of the student hypothesesabove? Why or why not?

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Term
Fall
Professor
Murphy,Lauren
Tags
Carbohydrate