Question

what is the use of staining a cell before mounting?

Answer 1

Cell staining is a technique that can be used to better visualize cells and cell components under a microscope. By using different stains, one can preferentially stain certain cell components, such as a nucleus or a cell wall, or the entire cell.
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Answer 2

The main reason you stain a specimen before putting it under the microscope is to get a better look at it, but staining does much more than simply highlight the outlines of cells. Some stains can penetrate cell walls and highlight cell components, and this can help scientists visualize metabolic processes. Stains also help distinguish between live cells and dead ones. Moreover, staining allows scientists count the number of cells of a particular type within a certain biomass. Twenty or more different types of stains exist, and each one has its purpose.