Discussion
The scales of hair can be preserved with the help of
Answer: B
The scales of hair can be preserved with the help of nail polish. A thin layer of clear nail polish is spread on a slide, the hair is pressed on to it, and when it dries and the hair is removed, the cuticle scale pattern remains as a cast that can be examined under the microscope. Wax, plaster of Paris and plasticine are used to take casts of tool marks, footprints and similar large impressions, and are too coarse to record the fine scale pattern of a hair. So B is correct.
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