Which one of the following is NOT a natural fibre?

Terylene

The correct answer is option 3. Terylene.

Terylene is not a natural fiber; it is a synthetic fiber. Terylene is a brand name for polyester, which is a man-made polymer fiber produced from petrochemicals. It is commonly used in the textile industry for its strength, durability, and wrinkle resistance.

Flax (option 1), jute (option 2), and wool (option 4) are all examples of natural fibers. Flax is derived from the flax plant, jute from the jute plant, and wool from the fleece of sheep or other animals such as goats and alpacas.