Presentation on theme: "Surface Area to Volume Ratios"— Presentation transcript:
1 Surface Area to Volume Ratios Chapter 10: Cell Division
2 Surface AreaA measure of the number of square units needed to cover the faces or surfaces of a figure.Surface Area = Length x Width x # of sides
3 Example of Surface Area A cube has 6 equal sides, so theSurface Area = 6 x L2 Example: The length of one side of a cube is 0.5 cm. Calculate the Surface Area of the cube.Surface Area = 6 x L 2 = 6 x (0.5)2 = 6 x 0.25 = 1.5 cm2
4 Volume The amount of space occupied by a three-dimensional object Volume = Length x Width x Height
5 Example of Volume A cube has 6 equal sides, so the Volume = L3 Example: The length of one side of a cube is 0.5 cm. Calculate the volume of the cube.Volume = L3= (0.5)3 = cm3
6 Example of Surface Area to Volume Ratio 0.5 x 0.5 x 6 =1.5 cm 2Volume0.5 x 0.5 x 0.5 = cm 3Ratio of Surface Area to Volume1.5/0.125 = 12:1
7 Surface Area to Volume Ratios Changes in the surface area to volume ratio are important in determining an organism’s size, and help explain some of the modifications seen in larger-bodied organisms.Imagine a cell shaped like a cube. As the length of the sides of a cube increases, its volume increases faster than its surface area, decreasing the ratio of surface area to volume.If a cell gets too large, its surface area is not large enough to get enough oxygen and nutrients in and waste out efficiently.