Uses of fibres and history of clothing - class-VI

Yarn itself is a loose thread and they can be split into thin strands. 

The process of making yarn from fibres is called spinning. Weaving is the process used to convert yarn into fabric.

Fibres which are not obtained from plants and animals and are made in a laboratory using petrochemicals are called synthetic fibre.

The thick part of the grass is used in making furniture items; its outer skin makes for thatch. The leaf of the grass is called moonj.

Silkworm, its larvae are fed with mulberry leaves, and, after the fourth moult, they climb a twig placed near them and spin their silken cocoons. 

Preshrink cotton is known as sanforized cotton.

Nylon is a man-made synthetic fibre prepared by the process of polymerisation. 

The correct statements will be-

The botanical name of this plant is Sachatum moonja.

Cotton is usually picked by hands and fibres and then separated from the seeds by combing.

A, B and C are natural fibres. 

Rayon or artificial silk, nylon and acrylic represents fibre. Polyester and cotton are another example of fibre.

 All of the following represent(s) the characteristics of synthetic fibres.
They dry up quickly.
They are durable
They are less expensive and readily available.
They are easy to maintain

Burrs are the small filthy fibers. This has a pattern of knots. 

The female silk moth lays 200 eggs at a time, these eggs are stored on strips of cloth. The stored eggs are then kept under hygienic conditions, suitable temperature and humidity.

Table is made up of wood or wood pulp but cloth, rope and carpet are made up of various types of fibres and yarns which form these materials.

Endoscopes use bundles of optical fibres to transmit light and images from inside the body, relying on the principle of total internal reflection.

Synthetic fibres are also called as artificial or human made fibres since they are made by human in factories.

Spandex, Lycra or elastane is a synthetic fiber known for its exceptional elasticity. It is stronger and more durable than natural rubber. Because of its elasticity and strength (stretching up to five times its length), spandex has been incorporated into a wide range of garments, especially in skin-tight garments. A benefit of spandex is its significant strength and elasticity and its ability to return to the original shape after stretching and faster drying than ordinary fabrics.

In liquid, particles are loosely bound together by intramolecular forces. Unlike a solid, liquid has no fixed shape but instead has a characteristic readiness to flow and therefore takes on the shape of any container.

Forces between them are moderately strong as compare to solid.

Hence, option $B$ is correct. 

Cellulose is made up of glucose units by glycosidic bonds.

Cotton bolls.

$Fibres$ are the thread forming solids which possess high strength and high modulus. This characteristic is attributed to the strong intermolecular forces like hydrogen bonding.

Weaving is a method of textile production in which two distinct sets of yarns or threads are interlaced at right angles to form a fabric or cloth. Cloth is made by crossing two sets of threads over and under each other. The two sets of threads are called warp and weft.

Acrylic fibers are synthetic fibers made from a polymer
(polyacrylonitrile) with an average molecular weight of $\sim100,000$,
about $1900$ monomer units. Strong and warm, acrylic fiber is often
used for sweaters and tracksuits and as linings for boots and gloves, as
well as in furnishing fabrics and carpets. It is manufactured as a
filament, then cut into short staple lengths similar to wool hairs, and
spun into yarn.
option A is correct

After people began to settle in agricultural communities, they learnt to weave twigs and grass into mats and baskets. Vines, animal fleece or hair were twisted together into long strands. These were woven into fabrics.

In ancient times, barks and big leaves of trees or animal skins and furs were used by people to cover themselves.

Stitched clothes have gone through many variations since the invention of stitching. But, even today, saree, dhoti, lungi or turban is used as an un-stitched piece of fabric.

After people began to settle in agricultural communities, they learnt to weave grass and twigs into mats and baskets.

Egypt is known as the oldest agricultural civilization. Due to less rainfall, river Nile was used as a source of water for agriculture. Hence, in ancient Egypt, cotton as well as flax were cultivated near the river Nile and were used for making fabrics.

With the invention of the sewing needle people started stitching fabrics to make clothes.

In ancient times, stitching was not known. People simply draped the fabrics around different parts of their body.

option $D$ is correct  answer.

The existing dress codes in Europe were swept away by french revolution.

Natural fibres are hairlike raw material directly obtainable from an animal, vegetable, or mineral source and convertible into non woven fabrics such as felt or paper or, after spinning into yarns, into woven cloth. A natural fiber may be further defined as an agglomeration of cells in which the diameter is negligible in comparison with the length examples: cellulose types such as cotton, wood, grains, and straw.
Synthetic fibers are fibers are human-made by chemical synthesis, as opposed to natural fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets into air and water, forming a thread. These fibers are called synthetic or artificial fibers. Some fibers (such as the diverse family of rayons) are manufactured from plant-derived cellulose and are thus semi-synthetic, whereas others are totally synthetic, being made from crudes and intermediates including petroleum, coal, limestone, air, and water.
therefore option A is correct

By weaving and knitting we can obtain fabric.

Synthetic fibers are prepared by using chemicals. These are made of small units that join together to form long chains. 

Fabric is made from $fibre$.