Question

Which of the following fibers is a protein fiber?

• A. Vicuna
• B. Sisal
• C. Kapok
• D. Saran

Hint:

Protein Fibers = Animal (Wool, Silk).
Cellulose Fibers = Plant (Cotton, Linen, Sisal, Jute).
Synthetic = Lab-made (Nylon, Polyester, Saran).

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
The question asks for the identification of a fiber that is animal-based and made of protein (polypeptide chains).

Step 2: Detailed Explanation:

• Fibers are classified as natural (Cellulose, Protein, Mineral) or man-made (Synthetic).

• Protein fibers come from animal hair, fur, or silk. Vicuna (A) is an animal related to the llama, found in the Andes. Its wool is the finest and rarest animal fiber in the world, consisting of keratin protein.

• Sisal (B) is a leaf fiber obtained from the agave plant (Cellulose).

• Kapok (C) is a seed hair fiber from the Ceiba tree (Cellulose).

• Saran (D) is a synthetic polymer (Polyvinylidene chloride).

• Therefore, only Vicuna fits the "protein fiber" category.

Step 3: Final Answer: Vicuna is a protein fiber.