Why are plant and animal specimens usually stained with dyes before observing them through a microscope ? Name one stain (or dye) used for this purpose.
Why do we stain cells while observing them under microscope? Give a list of the stains which we generally use to observe. [3 MARKS]
Which of the following organelle isn't visible under the microscope even after the use of a dye ?
a) vacoule b) nucleus c) mitochondria d) cell membrane