Question

explain the importance of cells smaller in size​

Answer 1

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. When this happens, the cell must divide into smaller cells with favorable surface area/volume ratios, or cease to function. That is why cells are so small

Answer 2

Cells smaller in size provides larger Surface area. The important point is that the surface area to the volume ratio gets smaller as the cell gets larger.