To determine which type of animal hair is best suited for the production of woollen cloth, let's compare the characteristics and utility of coarse beard hair and soft under-hair.
Coarse Beard Hair:
Structure: Coarse beard hair tends to be thicker and rougher.
Utility: The coarse nature makes it more suitable for industrial uses where texture is less of a concern, but it is not ideal for clothing as it can be uncomfortable against the skin.
Soft Under-Hair:
Structure: Soft under-hair is fine and has a soft texture.
Utility: This type of hair is more suitable for making woollen cloth because of its softness and the ability to trap air, providing warmth. It can be easily dyed, which allows for more variety in fabric colors and patterns. Additionally, the soft texture provides a comfortable feel against the skin.
When producing woollen cloth, the softness and texture are crucial factors as they contribute to the comfort and warmth of the fabric. Thus, soft under-hair is the best material for woollen cloth production. Among the given options, the correct choice is:
(b) Soft under-hair as they have a soft texture.
This selection is based on the suitability of soft under-hair for creating comfortable and warm textile products, which is the primary requirement for woolen fabrics.