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Surface Area to Volume Lab Report

BACKGROUND: The efficiency of diffusion will be measured by the length of time it takes for
the agar cubes to turn pink to clear
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An acid would then diffuse into the cubes causing them to turn colorless
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HYPOTHESIS: If the size of the agar cubes affects the rate of diffusion then the cube with the
biggest surface area to volume ratio will diffuse the fastest
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) Carefully cut 5 agar cubes (2mm, 4mm, 6mm, 8mm, 10mm in size)
2
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) Gently add HCL, just until all cubes are covered by the acid, begin timing as soon as acid
is added
4
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OBSERVATIONS

2mm

4mm

6mm

8mm

10mm

SA: 24 mm²

SA: 96 mm²

SA: 216 mm²

SA: 384 mm²

SA: 600 mm²

V: 8 mm³

V: 64 mm³

V: 216mm³

V: 512 mm³

V: 1000 mm³

1 minute

1 m 50s

4 minutes

6 m 48s

13m 21s

ANALYSIS:
1
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And our muscles cells would need more energy because they
carry out work for us so the cell demands more energy
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) As the cell gets smaller, what happens to the surface area to volume ratio?
As the cell gets smaller, the surface area to volume ratio increases contrary to it getting
bigger the surface area to volume ratio decreases
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) Based on this experiment, explain one reason why multicellular organisms are made of
many small cells and not a few large cells
Multicellular organisms are made up of many small cells, because those cells specialize
into creating different types of organ systems for our body
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4
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The surface area is
represented by the cell membrane
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5
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6
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The amount of oxygen that is diffused into the cell relies on the surface
area of the cell membrane
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This is more efficient for survival of the cell
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) What does surface area to volume ratio have to do with each of the following structures
a
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So
in frigid climates the SA to V ratio should be low to result in no heat loss and vice
versa in more equatorial regions
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) Plant roots: the roots of the plants also rely on the SA to V ratio of their root hairs
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c
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d
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e
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CONCLUSION:
Results: The surface area to volume ratio depends on almost every biotic creature and abiotic
creature to provide living capabilities
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Errors and Suggestions:
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Agar cube may have not been cut to size properly

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Since we poured HCl into the agar cube beakers one could’ve been hit by it first which
could have altered the results

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The concentration of the HCl was a random amount and could have been a changing
factor in the experiment



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