Question

Why glycerine is used for mounting the onion peel or cheek cell

Answer 1

Glycerine is used for preventing the peel and the cells in the peel from drying.

Answer 2

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We use glycerine for mounting onion feel for expelling bubbles which can be found between slides. ...

Glycerine is a good dried out agent. It avoids the drying of the specimen. Additionally, glycerine has a tendency to reflect light because of its refractive nature.

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Hope it helps... ¯\_(ツ)_/¯