Cell size Plant cells vary in size from about 7 m—the diameter of dividing cells at the tips of roots and Φ shoots—to fiber cells a few micrometers wide but a meter or more in length. Most plant (and animal) cells are between 10–100 m and thus too small to be seen without Φ magnification since human eyes have a resolving power (resolution) of about 100 m. (Resolving power is the ability to see Φ adjacent objects as separate; magnification simply makes things larger. Two things closer together than 100 m will look like one to the human eye unless a microscope with Φ a resolving power of less than 100 m is used. Φ Limits to cell growth Plant cells are separated from their environment by a cell wall inside of which a semi-liquid plasma membrane surrounds the cytoplasm and the nucleus . As cells grow, their volume increases faster
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