Question

how do microbes grow in number.explain

Answer 1

microbes grow by the following processes
cell division
budding
binary fission
fission
or even sexual reproduction

Answer 2

Microbes grow by a process called cell division . When a parent cell gets divided by its nucleus into two new daughter cells. And again those two cells divides forming four more cells. This is how microbes grow. And this is completely asexual reproduction.