Question 5 (Textile Technology & Fibre Science)
High extensibility of wool fibre is due to
| (A) | Presence of scales |
| (B) |  -helix structure of proteins |
| (C) | Cross – linking |
| (D) |  -sheet structure of proteins |
[Show Answer]
Option B is correct.
The high extensibility (stretchability) of wool fiber is due to its molecular structure. Wool fibers are composed of long, coiled protein molecules (keratin) that are held together by weak bonds. When the fibers are stretched, these bonds break and reform, allowing the fibers to elongate and return to their original length when released. This property gives wool its unique ability to stretch and recover, which contributes to its durability, comfort, and versatility. Additionally, the crimp (wave-like pattern) of wool fibers provides elasticity, further enhancing the fiber’s ability to stretch and return to its original shape.