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Diffusion and cell size

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Introduction

Diffusion and cell size Side of cube / cm � 0.05 cm Surface area / cm2 � 0.05 cm2 Volume / cm3 � 0.05 cm3 Distance penetrated / cm � 0.05 cm Distance not penetrated / cm � 0.05 cm Volume not penetrated / cm3 � 0.05 cm3 % of the total volume not penetrated 1 6 1 6:1 1 � � � 2 24 8 3:1 0.5 1 1 12.5 3 54 27 2:1 0.5 2 8 29.6 Discussion questions and answers * List the agar cubes in order of size, from largest to smallest. List them in order of surface area - to - volume ratio, from largest to smallest ratio. How does these lists compare? From largest to smallest in order of size: 3 cm, 2 cm, 1 cm. ...read more.

Middle

This change was slightly stronger in the beaker containing the largest agar block. Thus, this gives an indication that phenolphthalein was diffusing out from the agar block and into the sodium hydroxide solution. * What happens to the surface area - to - volume ratio of a cell as the cell grows? When a cell increases in size the surface area - to - volume ratio will decrease in order to bring in essential materials more easily as well as carrying out waste more effectively. * When one cube-shaped cell divides into two equal parts, how does the volume of each small cell compare with the one large cell? Does the surface area change in the same proportion? Explain. When the cell divides, the volume will remain the same due to the new cell being an exact copy of the cell which it was divided from. ...read more.

Conclusion

* What does the surface area of the cube represent? The surface area of the cube represents the rate at which different materials enter or leave the cell. This includes essential nutrients entering the cell and waste products exiting the cell. A cell with a larger surface area per unit volume is able to move more materials in and out of the cell. From the table above it can be concluded that the agar block with 1 cm sides, have the largest surface area per unit volume, thus is able to transport a larger amount of materials in and out of the cell. * What does the volume of the cube represent? The volume of the cube implies the rate at which different materials are used or produced, such as the production of heat and waste and the rate of consuming resources. ?? ?? ?? ?? Nathalie Zheng IB2 Biology HL 20100924 ...read more.

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