Question

Fibres obtained from plants and animals are called:
A. man made fibres
B. natural fibres
C. organic fibres
D. none of the above

Answer 1

Hint:Plants and animals contain cellulose fibers. These can be treated chemically and mechanically to produce fibers with various types of properties.

Complete answer:
Fibers are the altered or modified forms of cellulose obtained from natural sources. The natural sources include both plants and animals. The cellulose obtained from these sources is treated chemically to separate the desired fiber from the crude material.
The fibers which are obtained from plants and animals are called natural fibers. Fibers are found to be very thin and thread like strands which are used to generate fabrics and papers. The common fibers obtained from plants are cotton and jute. The common fibers obtained from animals are wool and silk.
Man-made fibers are the fibers which are synthesized by humans. They are prepared to improve the quality of the fibers obtained from natural sources. They are also termed as synthetic fibers. The common synthetic fibers are polyester, polyamide, polypropylene etc.
Organic fibers are the fibers which are crystalline polymers possessing high strength. These are also referred to as high performance fibers. Organic fibers are commonly used in textile applications. Aramid fibers are the most widely used organic fibers which are organic polyamides. They possess high stiffness and strength and have low thermal conductivity.
Hence option B is the correct answer.

Note: Plant fibers are known to include seed hairs such as cotton, stem fibers such as flax and hemp, leaf fibers such as sisal and husk fibers such as coconut. Animal fibers are known to include wool as hair and secretions such as silk.