Why cells are usually small
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Answers
The important point is that the surface area to the volume ratio gets smaller as the cell gets larger. Thus, if the cell grows beyond a certain limit, not enough material will be able to cross the membrane fast enough to accommodate the increased cellular volume. ... That is why cells are so small.
Cells tranmits nutrional materiak,excreatory material and many gases,which is completed by cell membrane,The transmission of material is completed in a limited time and no energy is used,It is only possible when cekl becomes small,If cells are larger in size then large amount of nutritional substances are required.If the size increases,then the volume of cell is also increase,Due to this the nutritional requirment is not fulfilledby the cell.
That's why the cells are smaller in size.