Discussion
A haemocytometer is used to
Answer: A
Correct answer: count cells in a known volume of suspension
A haemocytometer is a slide with a precisely etched grid and a chamber of known depth, so counting the cells within a defined number of squares gives a concentration directly. It remains standard because it is cheap and, with trypan blue, reports viability at the same time - dead cells take up the dye and living ones exclude it.
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