7th Class Science Sample Paper Science Sample Paper - 1

  • question_answer
    Describe the processing of fibres into wools.

    Answer:

    Following steps are involved in making wool.
    (i) Shearing: First of all, the fleece of the sheep along with a thin layer of the skin is removed.
    (ii) Scouring: Sheared skin is thoroughly washed in tanks to remove grease, dust and dirt.
    (iii) Sorting: This involves the separation of hairs of different textures.
    (iv) Drawing out the fibre: The small fluffy fibres popularly known as ?burrs? are picked out from the hair first, then scoured, dried and finally drawn into fibres.
    (v) Dyeing: Finally the fibres can be dyed into a variety of colours.


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