Discussion
Scales are found on the following fibre :
Answer: A
Scales are found on wool fibre. The surface of a wool fibre is covered with overlapping cuticle scales, which are used to identify it under the microscope.
Cotton is a flat twisted ribbon with convolutions, linen (flax) shows nodes and cross markings, and silk is a smooth, structureless filament. None of these has scales. A medico-legal examiner uses this feature in the study of trace fibres, since the scale pattern of an animal hair or fibre can be compared with a reference sample under a microscope, whereas the plant fibres and silk are identified by other features such as the lumen, twist and cross-section.
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