Classification of fibres - class-VI

yes, Yarn is made from fibres by spinning.

$A$ 

Animals fibres are those which largely consists protein. Some of the animals have the property to provide such kind of father or fur which can be used to produce wool. All the given examples are animal fibre use to form a different type of wool.

Pashmina a very fine quality of wool is obtained from goats.

$Merino$, 

Deer do not yield wool. Camels, sheep, goats, yaks yield wool. Wool is a natural fiber. 

Acrylic is a synthetic fibre resembling wool used to knit sweaters, socks, and shawls.

Polystyrene is also a synthetic fibre used for making protective packagings such as packing peanuts and CD and DVD cases, containers such as clamshells, lids, bottles, trays, tumblers, disposable cutlery and in the making of models.

Therefore, option C and D both are correct.

Terylene is a popular polyester. It can be drawn into very fine fibres that can be woven like any other yarn.

Shearing

Combing, it is a method for preparing carded fibre for spinning. Combing is divided into linear and circular combing. The Noble Comb is an example of circular combing. The French comb is an example of linear combing. The process of combing is accompanied by filling, a process of evening out carded or combed top making it suitable for spinning. Combing separates short fibres using a rotating ring or rectilinear row of steel pins. The fibres in the 'top' produce have been straightened and lie parallel to each other. When combing wool, the discarded short fibres are called boils and are ground up into shoddy.

(a) Scouring means cleaning the sheared skin of animals.

Natural fibres are fibres extracted from plants and animals. 

Cotton is a natural fiber it has the tendency to absorb the sweat. Also, its a breathing fabric and so allows air to pass through keeping your body cool.  cotton is the best fabric to use in summer.

Coir is extracted from the tissues surrounding the seed of the coconut palm. 

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. 

Cotton is the fibre that bums completely, leaving no residue.

In summer, it is advised to wear clothes made of cotton. We sweat a lot in summers. Cotton is a good absorber of water. Thus, it absorbs sweat from our body and exposes the sweat to the atmosphere, making its evaporation faster.

Hill stations are crowded and have waste disposal problem. Thus, plastic use should be minimum. Some hill stations like Nainital, have banned use of polyethene bags.

The fruit part of cotton plant yields cotton balls.

Preshrink cotton is known as sanforized cotton.

The outer covering of coconut is called coir.

Fibers  are a class of hair-like materials that are continuous "'filaments"' or are in discrete elongated pieces, similar to pieces of thread. They can be used as a component of composite materials. 

Animal fibers are generally made up of proteins. 

Natural fibres are obtained from plants and animals.

Cotton is obtained from cotton plant and wool is obtained from sheep.

Animal fibers are natural fibers that consist largely of particular proteins. These proteins include collagen, keratin and fibroin.

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

Fibres which are man-made are called synthetic fibres and which occurs naturally are called natural fibres. Rayon (synthetic fibre), when mixed with cotton (natural fibre), is used to making curtains, bedsheets etc. of clothes, ropes, seat-belts, curtains, sleeping bags, parachutes, tents etc.

The correct statements will be-

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

The suitable climate for growing jute is a warm and wet climate, which is offered by the monsoon climate during the fall season, immediately followed by summer. Temperatures ranging from 25-30 °C and relative humidity of 70%–90% are favorable for successful cultivation. Jute requires 160-200 cm of rainfall weekly with extra needed during the sowing period. River basins or alluvial or loamy soils are best for jute cultivation. Jute cultivation in red soils may require a high dose of manure.

Fibres can be classified as natural fibres and synthetic fibres.
Natural fibres are obtained from plants and animals. The examples of such fibres include cotton, jute, silk and wool.
Synthetic fibres are made from chemical substances, which are not obtained from plant or animal sources. Examples include polyester, nylon and acrylic.