Question

Which of the following is not an animal fibre?
A) Silk
B) Wool
C) Polyester
D) Pashmina

Answer 1

Animal fibres are natural fibres that can be obtained from animals. These fibres are typically composed of various types of protein. It is important to note that animal fibres extracted from various animals typically have different properties.

Complete answer:
Animal fibres are typically used in the production of textile fibres. These fibres are typically made from animal hair, fur, skin, or certain secretions (usually from insects such as the silkworm). Animal fibres are usually woven or knitted (or sometimes felted) after they have been extracted to create beautiful animal fabrics.
Historically, animal fibres were used to make soft and warm jackets, wraps, blazers, shawls, ponchos, coats, and other types of clothing and accessories. Carpets, covers, and rugs are typically made of rougher animal fibres.
A) Silk:
Many people consider silk to be a “natural” protein fibre. In some cases, this animal fibre can be woven into textiles. The most well-known type of silk is that which is obtained from cocoons produced in captivity by silkworm larvae of the Bombyx mori species. Sericulture is a term used to describe the practise of raising silkworms.
It should also be noted that degummed fibres obtained from the Bombyx mori species have a diameter ranging from 5 to 10 m. Certain types of silk are well-known for their shimmery appearance, which is caused by the fibres' triangular prism-like cross-sectional structure.
It's worth noting that one entire silkworm cocoon yields one long fibre. As a result, care must be taken when unwinding the silkworm cocoon fibres.
B) Wool:
The term "wool" is commonly used to refer to animal fibres derived from the furs of Caprinae family animals. Although wool is typically sourced from sheep fur, wool from other animals such as rabbits, goats, and alpacas is not uncommon.
The primary distinction between sheep's wool and hair is that sheep's wool is known to contain overlapping scales (in a manner similar to shingles on a roof). Some types of wool, in fact, have over 20 such bends in a single inch. A strand of wool can have a diameter ranging from 17 to 35 micrometres.
C) Polyester:
Polyester is a completely synthetic fibre that is produced in a variety of industries using a variety of chemicals. Furthermore, polyester is not a natural animal fibre.
Polyester is a man-made fibre made from coal, air, water, and petroleum. Polyester fibres are created in a laboratory in the twentieth century through a chemical reaction between an acid and alcohol. In this reaction, two or more molecules combine to form a large molecule with a repeating structure along its length.
D) Pashmina:
Pashmina is a fine variant of spun cashmere, the animal-hair fibre that makes up the Changthangi goat's downy undercoat. Pashm is Persian for "wool," but in Kashmir, pashm refers to the raw, unspun wool of domesticated Changthangi goats. Today, the term pashmina can refer to either the material or the variant of the Kashmir shawl made from it.
Every spring, goats used for pashmina shed their winter coats. One goat sheds about 80–170 grammes (3–6 oz) of fibre. The goats naturally shed their undercoat in the spring (moulting season), which regrows in the winter.

Therefore the correct Answer is option (C) Polyester.

Note:
The following are the most common proteins found in animal fibres:
Collagen is a protein that is the primary component of mammalian connective tissue.
Keratin is a protein that belongs to a family of fibrous structural proteins known as scleroproteins.
Fibroin is an insoluble protein that is commonly found in the silk produced by the larvae of the Bombyx mori silkworm.