Question

if we stain the cell , sone parts of the cell appear darker.Why?​

Answer 1

they determine the presence of cell organelles of the cell.

Answer 2

Having absorbed the stain, these parts of the cell become more visible under the microscope and can therefore be easily distinguished from other parts of the same cell. ... Although the entire cell appears light blue in color, the nucleus at the central part of the cell is much darker, which allows it to be identified.