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venu, if you want to roughly estimate the growth then you can measure the diameter of a bacterial colony. This is the easiest way.

You are right rahul. Fungal colony or bacterial colony spreads from a central point in order to cover the surface of a growth medium. Hence you can easily measure their growth.

In liquid culture, the size of the bacteria can be measured by simply counting the cells.

payal, you can measure by counting cells or also by diluting the sample and then counting the cells