Answer the following questions in one word or a single sentence.
1. Name one semi-synthetic fibre.
2. Make a list of five animals from which wool is obtained.
3. What are natural fibres?
4. Define sericulture.
5. What do you understand by moulting?
Answers
Answer:
1)Semi-synthetic fibres are made from natural raw materials with a naturally occurring long-chain polymer structure. EG. Rayon
2) Sheep, goat, rabbit, camel and yak.
3) Natural fibres are the fibres acquired from natural sources such as animals and plants.
4) The production of silk and the rearing of silkworms.
5) The shedding or casting off of an outer layer or covering and the formation of its replacement.
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Answer: 1. rayon, 2. sheep, goat, rabbit, camel and yak, 3. Natural fibres are the fibres that are obtained from plants, animals or mineral sources. Some examples are cotton, silk, wool etc. Natural fibres can again be divided into two types based on their source i.e. plants and animals 4 .the production of silk and the rearing of silkworms for this purpose. 5 . In biology, moulting (British English), or molting (American English), also known as sloughing, shedding, or in many invertebrates, ecdysis, is the manner in which an animal routinely casts off a part of its body (often, but not always, an outer layer or covering), either at specific times of the year
Explanation: 1. semi-synthetic fibres are made from natural raw materials with a naturally occurring long-chain polymer structure. They are only modified and partially degraded by chemical processes. Most semi-synthetic fibres are cellulose regenerated fibres, the earliest of which is rayon, also known as viscose
2. Five animals from which wool is obtained are sheep, goat, rabbit, camel and yak.
3. What are Fibres?
Fibres are thread-like structures that are long, thin and flexible. These may be spun into yarns and then made into fabrics. There can be different types of fibres. On the basis of their origin, fibres are classified as natural fibres and synthetic fibres. Natural Fibres
Natural fibres are the fibres that are obtained from plants, animals or mineral sources. Some examples are cotton, silk, wool etc. Natural fibres can again be divided into two types based on their source i.e. plants and animals.
Examples of Natural Fibres
1. Animal fibres: These are the fibres that are obtained from animals. For example Wool, silk etc.
Wool: Wool is a natural textile fibre obtained from sheep, goats and camels. It traps a lot of air. Air is a bad conductor of heat. This makes clothes made from wool useful in winter.
Silk: Silk is also a natural textile fibre which is obtained from silkworms. The rearing of silkworm to obtain silk is known as sericulture.
2. Plant fibres: These are the ones that are obtained from plants. These fibres are extracted from the plants to make fabrics.
Cotton: It is one of the plant fibres that are used to make clothes. It is a soft staple fibre that is found as a boll around the seeds in a cotton plant.
Jute: It is a vegetable fibre that is soft, shiny and is spun into coarse strong threads.
4.Sericulture, the production of raw silk by means of raising caterpillars (larvae), particularly those of the domesticated silkworm (Bombyx mori).
Sericulture, or silk farming, is the cultivation of silkworms to produce silk. Although there are several commercial species of silkworms, Bombyx mori is the most widely used and intensively studied silkworm. Silk was believed to have first been produced in China as early as the Neolithic Period.
5. (of a bird or animal) to lose feathers, skin, or hair as a natural process at a particular time of year so that new feathers, skin, or hair can grow