
Concept explainers
To summarize:
The relationship between surface area and volume as a cell grows
Introduction:
A cell grows until it reaches its size limit, then it either stops growing or divides. Most cells undergo division. Most cells are less than 100μm in diameter. The ratio of surface area to volume is the key factor that limits the size of a cell. By remaining small cells have a higher ratio of surface area to volume and they can sustain themselves more easily.

Answer to Problem 10A
Asthe cell grows larger the surface area and volume increase. The volume increases more rapidly than the surface area and so the cell has difficulty in transporting nutrients and waste products.But the overall ratio of surface area to volume decreases with increase in size of the cell.
Explanation of Solution
Surface area of a cell refers to the area covered by the plasma membrane through which the nutrients and wastes must pass through. Volume refers to the space taken up by the contents of the cell. To calculate the surface area of the cube, we have to multiply length times width times the number of sides. To calculate the volume, we have to multiply length times width times height.
Suppose the length of a cell is 1cm.
Now if the cell grows larger to 2cm per side,
The new ratio of 3:1 is less than 6:1. Therefore we can say that as the cell grows larger the ratio of surface area to volume decreases. The relationship between surface area and volume limits the size of a particular cell.
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Biology Illinois Edition (Glencoe Science)
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